At Hells Canyon Mule Days, a few years back, a 34 yr old mule won the jumping comp! And the mule wasn't even that leggy.
I do believe that same mule later pulled a buggy and won that comp. Too!
My family has mules. One is a Hinny. Can't tell the difference. My parents use their mules mainly for trails and hunting, but can hold their own in the Mule competitions. My Dad got a team penning buckle after her ran the Musical Mules race. Mules can do anything~ heart for days.