Age is irrelevant, what's more important is where they are in life, what they want in life, lifestyle etc
My first dh was my age, as we hit our mid 20s he just didn't change, he was immature, lacked any ambition and ended up like an extra child for me to take care of!
I met my now dh when he was 24 and I was 35, he was full of life, ambitious and a million times more 'grown up' than my ex who was 11 years his senior!
The only issue is obviously children, I had 2 young children and didn't want anymore, I was very honest about this and dh was happy with this and as ex dh moved away and was largely absent, dh has very much been their other parent for the last decade.
We had a lot of stick when we first got together but ignored it, knowing full well if it had been dh who was older nobody would have had a problem with it!
I'm 50 now and haven't really aged much, dh is late 30s and hitting that patch where men generally seem to suddenly age and we find nobody really notices the age difference anymore!