Should I do anything to be 10 all my life?
That depends. What do you mean by anything?
I would be willing to be bald forever in order to be that age.
There is nothing wrong with thinking like that. It's fun to think of what-ifs. There is no harm in it as long as you don't dwell on it for a long time.
I know right. I'm going to develop a fun attitude towards life and not be afraid to try something new.
That's great. Have fun thinking of what-ifs and expanding your imagination.