diff --git a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/RiderCategory.java b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/RiderCategory.java
index ba0f33e9..b285ccab 100644
--- a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/RiderCategory.java
+++ b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/RiderCategory.java
@@ -17,6 +17,7 @@
 
 import org.onebusaway.csv_entities.schema.annotations.CsvField;
 import org.onebusaway.csv_entities.schema.annotations.CsvFields;
+import org.onebusaway.gtfs.annotations.Experimental;
 import org.onebusaway.gtfs.serialization.mappings.DefaultAgencyIdFieldMappingFactory;
 
 /**
@@ -27,20 +28,30 @@ public final class RiderCategory extends IdentityBean<AgencyAndId> {
 
   public static final int MISSING_VALUE = -999;
 
+  @Experimental(proposedBy = "https://github.com/google/transit/pull/511")
   @CsvField(name = "rider_category_id", mapping = DefaultAgencyIdFieldMappingFactory.class)
   private AgencyAndId id;
+
+  @Experimental(proposedBy = "https://github.com/google/transit/pull/511")
   @CsvField(name = "rider_category_name", optional = false)
   private String name;
 
   /**
    * 0 = not default category, 1 = default category
    */
+  @Experimental(proposedBy = "https://github.com/google/transit/pull/511")
   @CsvField(optional = true, defaultValue = "0")
   private int isDefaultFareCategory = 0;
+  
+  @Deprecated
   @CsvField(optional = true)
   private int minAge = MISSING_VALUE;
+
+  @Deprecated
   @CsvField(optional = true)
   private int maxAge = MISSING_VALUE;
+
+  @Experimental(proposedBy = "https://github.com/google/transit/pull/511")
   @CsvField(optional = true)
   private String eligibilityUrl;