I'm 20. Can I still learn ballet if I'm over 20 years old?

Of course! Most dance schools have adult classes where you can learn ballet and maybe even take a few exams if you wanted. You could even take part in annual dance shows and show off a bit. It might take a while for you to get into pointe shoes but, it's worth it! I am 15 and in mine and i love them. Go for it! :-)