That seems rather old.
I’ve known several people who were married as teenagers.
In fact the sister of an old boyfriend actually got married when she was 15, with her parents permission. They had to got to MD to do it too, and then she got married again (to the same guy) the following year in NY when she turned 16.
I knew her about 10 years after that (I think) and they were still happily married. The fellow was older than she, but I really don’t remember how much older.
Do you think that Joseph Smith was some young guy that married his young girlfriend when he added that 14 year old to his collection?