Yep, I've noticed this same thing. The amount of available people decreases more and more as you get older. By the time you get to your 30's it is not only the quantity but the quality that can become a problem too. People can have a lot of baggage from their past that might not make them desirable when it comes to dating. I know I have mine too, we all do. Even if you haven't dated much, that is a huge red flag in itself. Don't get me wrong, I'm sure a lot of these people are good for the right person, but it is like looking for a needle in a haystack to find the one that fits well with you and where you are at that point in your life, when you are younger that can be a lot easier to do because the availability is much higher. I dread the day when I hit my 40's and might have to settle for a lot less than I had hoped for, and no I don't mean a persons physical appearance, I am not real picky about that. I am a person that doesn't mind dating single moms, I actually enjoy it, it can be a very rewarding experience. At the same time though, it can be very difficult to find ones that still have the same interests as me. Is it too much to ask for a cool single mom that still likes to play video games?
One thing I've learned though, is that it all comes down to timing, maybe the right person for you isn't single at the current time but they may become single in the future. You just gotta find the right person at the right time, thats the tricky part.
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"I was born in a world where I don't fit in, so I guess the only choice is make a new one"