Do men just really care about youth and is youth the only thing for a woman?

So like finding the right guy is taking a lot of time I've had 2 failed relationships from my mid to late 20's and now I'm 31 and I'm still searching for the guy I want to settle with... So my question is that will men lose interest in me when I start reaching 40? I feel concerned cause I always see other guy who don't want kids but run over for girls in there 20's of at least that's what I see on TV or the internet .

Updates
+1 y
My requirements for a relationship is that I don't want kids and I do want the man to have money but it doesn't have to be a lot of money or anything like that, but enough for a decent living cause well my income is not much so that's why.
Do men just really care about youth and is youth the only thing for a woman?
Post Opinion