Following a breakfast of shredded wheat and grapefruit juice, 76-year-old Martin Schoenfeld shaved, tied his shoes, and put on a fresh shirt in preparation for an afternoon of errands at the Pompano Citi Centre with his new lady friend, Marcy Larroway, 73. 'I've got the car warming up outside,' Schoenfeld said while working a dab of Brylcreem through his hair and deciding whether the two would purchase stamps at the post office first or go straight to the Hallmark store. 'Maybe we'll have time for a matinee after the pharmacy. It's right nearby.' At press time, Schoenfeld was calling to confirm his 5 p.m. dinner reservation for two at the HomeTown Buffet. 