1) My dating age range was set to 30 to 45. After going on a couple of dates with 30 year olds (and bearing in mind that I was last dating in my early 30s), I switched to 36 to 45 because My Word, when did 30 year olds get so _young_? This is a long-winded way of saying that older men only wanting younger women is by no means a universal.
2) Some men really want children, and some really don't, but most will go along with whatever happens, and be happy if it does. Most of my male friends with children validate this: they are happy to have children, but admit it happened because it was what their partners wanted. This is a long-winded way of suggesting that when it comes to evaluating potential partners, the buckets should be "definitely doesn't want children" (so, not for you) and "everyone else". You don't need to only sample from the "definitely wants children soon" bucket. That bucket is tiny.
3) Being indelicate, after 30 people age very differently. Aging well makes you a catch :).