That's an excellent question, Wendy. I don't have an answer. Five of the other 6 PD riders were young onset. 3 men, 4 women, 2 men with DBS, no women with DBS. One man and I rode solo; everyone else on tandems. All of us wee repeat riders. Keeping the cadence and riding as long as you can, even breaking your ride into segments is fine. I encourage people to set their own goals and rewards, not try to replicate someone else. It sounds like you're doing great.