This is America. You can do anything you want.
If you go into it as a hobby i dont see why not? It's great exercise.
I could have never been a professional dancer but I absolutely loved taking dancing lessons. My husband hated it so it's not fun with him not enjoying it so I stopped but I would go back in a heartbeat if he was game. If you enjoy solo dancing, you absolutely owe it to yourself to take those classes just for fun.
You shouldn't feel silly. Its a thing. There are adult drop in classes in NYC if that is where you - Broadway Dance Center, Joffrey, Steps - just to name a few. Levels from Basic Beginner all the way to advanced.
There is nowhere better in the world to take adult dance classes than NYC! Go for it!
Do what makes you happy!!
I used to take adult beginner ballet at Steps on Broadway - absolutely loved it. They have a huge range of adult classes for all abilities, go for it!