You want to go back to school? Awesome. Go for it. No age is too late.
You want to lose weight? Watch what you eat and exercise. Get a gym membership or a personal trainer if you can afford it. There are so many options for you and it's never too late.
You want to learn a language? Do it! Sure it's easier when you're younger but you can still do it. It will just take a little work. Get Rosetta Stone. Take a class. Check out DuoLingo.
You want to play guitar? Sweet! Youtube videos. Online lessons. Take a music class. Share your music with the world!!
You want to rock climb? Easy-peasy. There are places all over the country. Look it up and just go.
I could go on and on and on. The point is if you want to do something don't let anyone or anything stop you.