If you guys are serious about this question check out the Van Cliburn International Piano Competition for amateurs which has taken place a couple of times already. You will see lawyers, doctors, flight attendants, massage therapists, electrical engneers, math professors, etc. playing big works like the Prokofiev Eighth Sonata, Liszt Sonata. The contestants have to be over 35 and cannot earn their living from playing or teaching piano. What they do is really impressive.