Am I too old?

After high school, I went to college, but I never got a degree. I tried a couple of times to go back but it just didn't work out. I've been married almost 20 years and stopped working when my first child was born. I don't necessarily NEED to work, but I want to. And I know I could get a regular retail job or something anywhere. I just want to feel good about myself. I want something do something that makes me feel accomplished. I was diagnosed with ADHD not long ago, still working on ways to deal with that. I feel so useless though. I want my kids to see that I didn't give up on myself.

What are my options? Can I get certified for anything within a year or two. Maybe something remote? Not really sure what to do or where to start. What are some options out there for me at this age?