How often do tattoos stretch or become disfigured as you get older?

Im 18 and i have one tattoo on my right shoulder and i want to get another tattoo but i dont where i should put it on my body without it stretching overtime because i am still growing. I was planning to get one on my inner biscep of my right arm but i figured it would stretch because i know im going to build more muscle their. I never heard of tattoos stretching over time but i still dont see how a tattoo wouldnt stretch if your body continues to grow. So all i want to know is that if its possible for tattoos to stretch when your body continues to grow. If so, i also want to know where is the best place on my body to get my tattoo with out it ever stretching?
I realize my tattoos will eventually become stretched out and wrinkled when im old. Thats common sense right their, but what i want to know is, is it common to have tattoos stretch out when your body continues to grow within 10 years?