Senior citizens: Is it true relationships with the opposite sex don't work out in your 20's? If so why?

[shipwreck]

I married at 19 divorced at 35 because I was stupid at 19 and picked a bad man. I believed marriage was for life so stayed way too long.

My grandmother married at 16 stayed married 54 years. Mom married at 19 stayed married 47 years. Little brother married at 18 to a 17 year old married 45 years so far and seem happy. Big bro is on his 6th marriage twice each to two wives. He was 65 when he married this one and he finally seem mature enough but wife is incredible women he better not blow it or we are keeping her in the divorce. We still are friends with his first wive but they were very immature married her when he was 21 she was 18 and they both failed at marriage. He was in the service so seldom home, she cheated but I am sure he did too. She seems happy with her third husband it has been 30 years for them, really nice guy.