pretty sure no matter the age its a lot easier to pull a muscle if you don't stretch first. i'm only 19 and for some reason i haven't been stretching before skating lately and ive been feeling it. the best ones i find is a stretch where you sit down and touch both toes with both hands. also do a butterfly stretch kinda hard to explain that one, google it and you will see some demonstrations. that stretch is good because it stops you from pulling your groin which is a muscle that is mad easy to pull while skating. i remember pulling that shit once and i wasnt able to skate for almost a month