A winning ensemble led by Jamie Parker deliver a refreshing piece The short story F Scott Fitzgerald wrote as a challenge, of a man born 70 years old whose body gets younger as the years pass, has already been blown up into a lengthy film of the same name starring Brad Pitt (and lots of CGI). Jethro Compton decided a bare-bones musical for six multi-instrumentalists and no special effects was what it needed to be, an…