my in-laws stopped when they couldn't risk the injuries from falls. they had a bad crash (into each other) on vacation. one of them stopped & the other was too close to stop in time. nothing broken but some scraps, cuts & blood, I think. that was a sad day when they stopped cuz they always brought their bikes on vacation. Wifey always insists we bring ours, which I find heartwarming. we're in our low 60s ... still have more rides ahead of us!