I know a guy who does street performance gigs. He was a serious college cheerleader (doing human pyramids, trampoline routines, etc.) in his 20's. He is still going - but when only in his 50's, he talked about how physically demanding it was (even if doing no more than card tricks for kids, or riding around in costume on a "pretty easy"-height unicycle). You gotta stay in character, in your routine, with zero mistakes - hour after hour, no matter the weather.