I do not think age matters. I know two couple who married young and they are still happily together after 22 and 19 years together.
The couple that has been together for 22 years got married when they were both 20 years old.
The couple that will celebrate their 19th anniversary in November were married when she was 19 and he was 22.

My grandma married my grandpa when she was just 16. She lied about her age and apparently back in 1941 you did not have to prove your age. They were married until he died in 1996.

My boyfriend got married when he was 30 and it lasted less than 2 years. So age has nothing to do with it, IMO.

I am 37, have never been married and honestly do not ever see myself getting married. Oh well, I'm happy!

ETA: I just looked at the article and it looks like the youngest person was 21 (I didn't look through all of them, too slow to load). Didn't Macaulay Culkin get married when he was like 17 or 18? That was a HUGE deal too when that happened back in 1998.