I had DS1 when I was 28
I had DS2 when I was 38
DS1 turns 18 next week and DS2 turns 8 next week.
It's been fine, challenges and easier things like all families I suppose.
Never had any problems with jealousy. I feel I can meet their individual needs as they arise. DS1 minds DS2 so I can go out (single parent).
DS2 has had to be driven all over the place to DS1's things, but that's common with teens and younger siblings.
They spend time together, watching telly, playing Monopoly, DS1 will sometimes come to the cinema for kids films, or they go to the park to play football.
We will really miss DS1 when he goes to Uni this autumn but it means I get some one to one time with DS2 which will benefit him.
I think I would have struggled having two very close together. I was very relaxed when DS2 came along and that persists into his schooling now, I just don't stress about it.
I love that I get to do adult things with DS1 and then the fun of birthday shopping and Xmas for the little one.