diff --git a/distribution/openrct2.d.ts b/distribution/openrct2.d.ts
index f02864eeba..9ab427b5b8 100644
--- a/distribution/openrct2.d.ts
+++ b/distribution/openrct2.d.ts
@@ -773,6 +773,11 @@ declare global {
          * The total number of customers the ride has served since it was built.
          */
         totalCustomers: number;
+
+        /**
+         * The date in months when the ride was built.
+         */
+        buildDate: number;
     }
 
     type RideClassification = "ride" | "stall" | "facility";
diff --git a/src/openrct2-ui/windows/Ride.cpp b/src/openrct2-ui/windows/Ride.cpp
index 168fb93d37..93b348094d 100644
--- a/src/openrct2-ui/windows/Ride.cpp
+++ b/src/openrct2-ui/windows/Ride.cpp
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -6980,7 +6980,7 @@ static void window_ride_customer_paint(rct_window* w, rct_drawpixelinfo* dpi)
 {
     int32_t x, y;
     uint8_t shopItem;
-    int16_t popularity, satisfaction, queueTime, age;
+    int16_t popularity, satisfaction, queueTime;
     int32_t customersPerHour;
     rct_string_id stringId;
 
@@ -7080,7 +7080,7 @@ static void window_ride_customer_paint(rct_window* w, rct_drawpixelinfo* dpi)
 
     // Age
     // If the ride has a build date that is in the future, show it as built this year.
-    age = std::max((gDateMonthsElapsed - ride->build_date) / 8, 0);
+    int16_t age = std::max(date_get_year(ride->GetAge()), 0);
     stringId = age == 0 ? STR_BUILT_THIS_YEAR : age == 1 ? STR_BUILT_LAST_YEAR : STR_BUILT_YEARS_AGO;
     gfx_draw_string_left(dpi, stringId, &age, COLOUR_BLACK, x, y);
 }
diff --git a/src/openrct2-ui/windows/RideList.cpp b/src/openrct2-ui/windows/RideList.cpp
index d9ee1e3921..9230132738 100644
--- a/src/openrct2-ui/windows/RideList.cpp
+++ b/src/openrct2-ui/windows/RideList.cpp
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -665,7 +665,7 @@ static void window_ride_list_scrollpaint(rct_window* w, rct_drawpixelinfo* dpi,
                 break;
             case INFORMATION_TYPE_AGE:
             {
-                int16_t age = date_get_year(gDateMonthsElapsed - ride->build_date);
+                int16_t age = date_get_year(ride->GetAge());
                 switch (age)
                 {
                     case 0:
diff --git a/src/openrct2/rct1/RCT1.h b/src/openrct2/rct1/RCT1.h
index 1be1252336..0fa870505d 100644
--- a/src/openrct2/rct1/RCT1.h
+++ b/src/openrct2/rct1/RCT1.h
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -176,7 +176,7 @@ struct rct1_ride
     uint8_t pad_11F[0x7];              // 0x11F
     uint8_t spiral_slide_progress;     // 0x126
     uint8_t pad_127[0x9];              // 0x127
-    int16_t build_date;                // 0x130
+    uint16_t build_date;               // 0x130
     money16 upkeep_cost;               // 0x131
     uint16_t race_winner;              // 0x132
     uint8_t unk_134[2];                // 0x134
diff --git a/src/openrct2/rct2/RCT2.h b/src/openrct2/rct2/RCT2.h
index 7e764acfc0..7fd20e0787 100644
--- a/src/openrct2/rct2/RCT2.h
+++ b/src/openrct2/rct2/RCT2.h
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -251,7 +251,7 @@ struct rct2_ride
     uint8_t pad_16F[0x7];              // 0x16F
     uint8_t spiral_slide_progress;     // 0x176
     uint8_t pad_177[0x9];              // 0x177
-    int16_t build_date;                // 0x180
+    uint16_t build_date;               // 0x180
     money16 upkeep_cost;               // 0x182
     uint16_t race_winner;              // 0x184
     uint8_t pad_186[0x02];             // 0x186
diff --git a/src/openrct2/ride/Ride.cpp b/src/openrct2/ride/Ride.cpp
index 03a2b48536..4947e80d25 100644
--- a/src/openrct2/ride/Ride.cpp
+++ b/src/openrct2/ride/Ride.cpp
@@ -248,6 +248,11 @@ int32_t ride_get_count()
     return static_cast<int32_t>(GetRideManager().size());
 }
 
+int32_t Ride::GetAge() const
+{
+    return static_cast<int32_t>(gDateMonthsElapsed) - build_date;
+}
+
 int32_t Ride::GetTotalQueueLength() const
 {
     int32_t i, queueLength = 0;
@@ -891,7 +896,9 @@ void ride_init_all()
 void reset_all_ride_build_dates()
 {
     for (auto& ride : GetRideManager())
-        ride.build_date -= gDateMonthsElapsed;
+    {
+        ride.build_date = gDateMonthsElapsed;
+    }
 }
 
 #pragma endregion
@@ -2214,8 +2221,7 @@ static void ride_inspection_update(Ride* ride)
 
 static int32_t get_age_penalty(Ride* ride)
 {
-    int32_t years;
-    years = date_get_year(gDateMonthsElapsed - ride->build_date);
+    auto years = date_get_year(ride->GetAge());
     switch (years)
     {
         case 0:
@@ -2308,7 +2314,7 @@ static void ride_breakdown_update(Ride* ride)
  */
 static int32_t ride_get_new_breakdown_problem(Ride* ride)
 {
-    int32_t availableBreakdownProblems, monthsOld, totalProbability, randomProbability, problemBits, breakdownProblem;
+    int32_t availableBreakdownProblems, totalProbability, randomProbability, problemBits, breakdownProblem;
 
     // Brake failure is more likely when it's raining
     _breakdownProblemProbabilities[BREAKDOWN_BRAKES_FAILURE] = climate_is_raining() ? 20 : 3;
@@ -2356,7 +2362,7 @@ static int32_t ride_get_new_breakdown_problem(Ride* ride)
     if (gCheatsDisableBrakesFailure)
         return -1;
 
-    monthsOld = gDateMonthsElapsed - ride->build_date;
+    auto monthsOld = ride->GetAge();
     if (monthsOld < 16 || ride->reliability_percentage > 50)
         return -1;
 
diff --git a/src/openrct2/ride/Ride.h b/src/openrct2/ride/Ride.h
index 4ea175f957..6f06d17494 100644
--- a/src/openrct2/ride/Ride.h
+++ b/src/openrct2/ride/Ride.h
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -306,7 +306,7 @@ struct Ride
     };
     uint8_t slide_peep_t_shirt_colour;
     uint8_t spiral_slide_progress;
-    int16_t build_date;
+    uint16_t build_date;
     money16 upkeep_cost;
     uint16_t race_winner;
     uint32_t music_position;
@@ -411,6 +411,7 @@ public:
 
     rct_ride_entry* GetRideEntry() const;
 
+    int32_t GetAge() const;
     int32_t GetTotalQueueLength() const;
     int32_t GetMaxQueueTime() const;
 
diff --git a/src/openrct2/ride/RideRatings.cpp b/src/openrct2/ride/RideRatings.cpp
index d12ec006b8..27c093ebcc 100644
--- a/src/openrct2/ride/RideRatings.cpp
+++ b/src/openrct2/ride/RideRatings.cpp
@@ -1,5 +1,5 @@
 /*****************************************************************************
- * Copyright (c) 2014-2019 OpenRCT2 developers
+ * Copyright (c) 2014-2020 OpenRCT2 developers
  *
  * For a complete list of all authors, please refer to contributors.md
  * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
@@ -846,7 +846,7 @@ static void ride_ratings_calculate_value(Ride* ride)
     int32_t monthsOld = 0;
     if (!gCheatsDisableRideValueAging)
     {
-        monthsOld = gDateMonthsElapsed - ride->build_date;
+        monthsOld = ride->GetAge();
     }
 
     const row* ageTable = ageTableNew;
diff --git a/src/openrct2/scripting/ScRide.hpp b/src/openrct2/scripting/ScRide.hpp
index dde56e0a1c..e8d7470716 100644
--- a/src/openrct2/scripting/ScRide.hpp
+++ b/src/openrct2/scripting/ScRide.hpp
@@ -549,6 +549,21 @@ namespace OpenRCT2::Scripting
             }
         }
 
+        int16_t buildDate_get() const
+        {
+            auto ride = GetRide();
+            return ride != nullptr ? ride->build_date : 0;
+        }
+        void buildDate_set(int16_t value)
+        {
+            ThrowIfGameStateNotMutable();
+            auto ride = GetRide();
+            if (ride != nullptr)
+            {
+                ride->build_date = value;
+            }
+        }
+
         Ride* GetRide() const
         {
             return get_ride(_rideId);
@@ -581,6 +596,7 @@ namespace OpenRCT2::Scripting
             dukglue_register_property(ctx, &ScRide::intensity_get, &ScRide::intensity_set, "intensity");
             dukglue_register_property(ctx, &ScRide::nausea_get, &ScRide::nausea_set, "nausea");
             dukglue_register_property(ctx, &ScRide::totalCustomers_get, &ScRide::totalCustomers_set, "totalCustomers");
+            dukglue_register_property(ctx, &ScRide::buildDate_get, &ScRide::buildDate_set, "buildDate");
         }
     };
 } // namespace OpenRCT2::Scripting