It’s never too late to climb your first mountain, write your first novel … or stun the art world with a spectacular debut. This is the truth exemplified by Albert Nahman, whose first-ever art opening at age 82 offers inspiration to doers and dreamers of all ages. His impact on the fine art community commences on Sept. 6, as Gallery 202 in Franklin, Tennessee, hosts a free public reception for Nahman amidst a…