There is a glitch right now with ages. If a player's birthday falls past today's date there is a glitch that skips a year for some reason.
EXAMPLE: The glitch is if a player is really 22 in real life and his birthday is in December (lets say) the game doesn't allow you to give him his current age of 22. Your options are either 21 or 23. That is probably the issue you might be experiencing.