I am 24 years old. I have facial hair as normally to a 16 years old boy.what I do to grow it fast?is mastuburation might be a cause of it?

Are you saying you're trying to grow more facial hair?

The ability to either grow hair or not is purely genetics. Some guys can grow a full beard while others may only have a few lonely whiskers. There's no magical way to make it grow.

It is what it is.

Masturbation and facial hair are not correlated at all.

Masterbate free of guilt that it will affect your ability to grow facial hair.