Board Thread:Character Discussion/@comment-7526254-20160510162817/@comment-25926288-20171211145320

Well, noone can say that Snow was 18 when her father died. That's speculation.

Snow got a tiny pony at the age of 15, We see an older horse, lots of tourney wins, and Ginny's voice in Enter the Dragon, yet Regina can barely do a fireball and can't even teleport. If we assume she's roughly 18 in Enter the Dragon, then more years have passed by.

You're more or less calculating a minimum age for Snow/David at 22, but it doesn't mean it's the exact age.