Your question seems a bit tricky. Even if you go out for a walk, you can't even be sure if a woman you bump into is a single mom. It's not as if they have this tag that shouts, "Hey, I'm a single mom!" Kidding aside, there are a lot of dating apps that you can turn to. Yes, you may consider Tinder, as it is quite popular and I think people of all ages, who are ready for a relationship, use it. Another app which you may want to try is OkCupid. I think it is better than Tinder because it allows users to say more about themselves like what their hobbies, interests, favorite movies/series are among others. Having this kind of information ready will make it easier to know whether you have something in common.