With the median age of this group of distinguished gentlemen teetering around 75, the “10:30 Coffee Club” just celebrated 55 years of togetherness. The band of merry men gathers Monday through Friday, except for holidays, at 10:30 a.m. for a half-hour of coffee and conversation, though some arrive shortly after 10 and many linger after 11. Their friendship and camaraderie have long outlasted most politicians and Hollywood stars, clothing fads and hairdos and don’ts, some daily newspapers and even the very businesses or restaurants they’ve called home.