Well, considering the one of the biggest reasons for divorce is financial stress, under educated people tend to make less money than more educated people, regardless of their age. Less education then leads to higher instability within the marriage, which may cause more divorces.
Everything you said is correct, and it may be the answer to why people who wait longer to get married still end up getting divorced.
I still don't think it's as low as you say lol.
Too lazy to find a signature
ORB Jr. is my husband.