for sure you will be able to do it! :D
If you start, don't start with a big game, or you will get stuck for a long time on it and sometimes, never finish it :P
Today is easier to start to create games... a lot of good resources and tutorials over the internet...
I'm 24 and this is my first project (alone), I was only able to do it because of a Game Publisher that will help me with a little investment... before get to work on it again, I was working on 2 jobs only to pay my bills D: Brazil sux.