For Sam Rivers, both art and life are long Nearing 80, the jazz saxophonist with an abiding passion for 'spontaneous creativity' opens at the Bakery. By Don Heckman Special to The Times September 23 2003 Ask saxophonist Sam Rivers about his impending 80th birthday on Thursday and he just laughs. "I don't think about it much," he says. "I'm feeling fine and my son is a doctor. That always helps." Ask about his music, however, and the epigrammatic responses quickly expand into thoug