How old do i have to be to use protein powder?

Question by Niim >=D: How old do i have to be to use protein powder?
I’m currently 15, and very interested not in weight training but martial arts…
i have decided to do weight training to enhance my muscular speed and power but i want to do this as quickly as possible.
one suggestiong is protein powder…but is there an age limit?
and what are the side effects?
is it okay to eat my usual amount of protein meat if i use the protein powder?

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