I started to learn about bitcoin in my 20's.im still learning most of us wish to learn it pretty earlier but i think 20's is not the bad time to start learning about bitcoin.
That's still a good age for you to start learning things about Bitcoin. There's no early or late age to begin studying things about Bitcoin as long as we could understand and adapt everything including its risks clearly. I have actually learned about Bitcoin at 25 where I'm already focusing on stability and earning good profit. I just have a little regret because I've heard about Bitcoin at an earlier age yet I ignored it.