I'd be in the 35-40 bracket and kept my focus on girls in late 20s, some early to mid 30s. Career girls who don't have a lot of time for dating, or single mums, both my forte lol. You get a sense for it from their profiles and a few messages in.
I'm no oil painting but you gotta remember these girls are on tinder for a reason. They all know the reputation it has. If they were chasing wedding bells, they'd be paying for match dot com.
It's a numbers game, you gotta match with about 50 girls to get one or two who you'll end up chatting to in a suggestive manner. So again if you can devote time and effort to it (even on the sneak) then it can pay off.
There is always the option of punting, or paying for the full use of Seeking, but tinder is a free option.