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U need to be 18, but if ur parents dont mind u getting a tattoo then they will have to sign. But u are 13, some people make stupid tattoo. A guy had tattoo in rare parts of his body and colorful, black and white and tbh he looked weird.
Just give yourself some time, maybe when u are in hs if ur parents agree of u getting a tattoo, and really decode on what u want and not regret later.