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Yggdrasil will only age when you send a horse over the age of 25 to Heaven. Yggdrasil will age according to the age of the horse who dies and is sent to Heaven, so if you send a horse who is 25 to Heaven, Yggdrasil will age 25 years. If your horse dies at 30 years 8 months and you send it to Heaven, Yggdrasil ages 30 years. Etc.

Most mortal horses will live to 32 years old without much effort.