Horse's age based on a point system, each race or tournament a horse is entered in will go towards their aging process. Points are assigned based on the following chart:

For every 3 points a horse accumulates it will age by 1 year. So, for example if a horse is in a claiming race (0.5 pts), a white race (1 pt), a green race (1 pt), and a blue tournament (1 pt) then it will have accumulated 3.5 points. So, it will age by 1 year and the remaining 0.5 pts will continue to carry forward. Notice that an entire blue or general tournament counts as 1 pt. A horse will most likely race in more than one race in a blue or general tournament but will only age by 1 pt for the whole tournament. The number of races the horse runs in the tournament makes no difference as it will age by 1 pt for the whole tournament. If a horse is entered in a tournament and runs in no qualifying races the horse will still age by 1 pt so make sure to enter into qualifying races.