My sister eloped back in 1990. She was 21, and he was 25. They've been together for 13 years, but are unfortunately separating. They were going together for a while, and the wedding was postponed a few times before they eloped.
I got married at the ripe old age of 20. I went my then DH at 19, and he was older, 27. (I was a very mature 19!) We met in February/March of 1990, went on our first date in May of 1990... and then got engaged October 1990. Married September 1991
Has it been easy? Sometimes, but remember there are hills and valleys all the time. There are many poeple that I know that get married due to a child circumstance. I personally think its great that he wants to support her and not leave. Your nephew shows great courage and resolve to work this all through.
They will have a lot together to work through. New marriage, new baby, new living situation all in a short time. Support them and love them.. they will have many naysayers..
As for 39, being a grandfather.. well, if I am doing my math,correctly your brother was young when he had him... he should remember that.
Since we got married young.. my mothers one requirement was dont make me a gradmother until I'm forty. She was 46 when my son was born!