I'm one of those people. I am 21 years older than my husband, I'm previously divorced, He's Muslim- I"m Catholic. We had no issues whatsoever overcoming any of those red flags, not even so much as an RFE for the entirety of his immigration journey. We've been happily married for 12 years.
OP: I've been on VJ for 11 years and I have never once seen anyone denied because of education differences, I've never even seen it come up. You don't have anything at all to worry about. Best of luck.