Sorry if this has been covered before. I tried searching, without success.

Was there an age limit for marriage witnesses?
For a while now I've had a note that one of the witnesses at my greatx4 grandparents' marriage in 1800 in Bray, Berkshire was the very exotically named Suffina Odett Hughes.
I've never followed it up - until now. I've found a Sophina Odell Hughes on the IGI baptised in Bray in 1787 which, unless she had a late baptism, would make her only 13 in 1800.
Should I be looking for someone else, or would she have been allowed to witness the marriage?
Jill