Depends where you live; in london (& not sure about other big cities,) there are a lot of single men, but I think they think they are god's gift by the time they are 30.
I think after thirty, as a woman you have to be a bit less idealistic about what you are looking for. not all men have had kids by 30, but i would be worried if he hadn't had at least one major relationship by 30 (live-in or divorced.)
FWIW, i met DP at 37, he is divorced with 2 kids, but we are now engaged and am pg with DC1. however, to echo the other, posters, I had to look further afield for him - we met in france.
also, the other thing i have noticed is the older the woman is when she is looking for a mate, usually the more financially secure she is; she then starts to look for a financial equal. this is a big mistake as many otherwise suitable men may earn half as much as you do, but everyone has something to put into the shared pot of a marriage / long term relationship.
it is really important to look at the bigger picture; how well will he look after you in terms of eg cooking meals, diy, emotional support etc, rather than you being second fiddle to his career....