On The Town

On the TownOn New York's First Avenue "strip"--running from about 59th Street up to 86th --you can tell a great deal about someone just by which bar he enters. The median age of the crowd at each bar, for example, climbs steadily as you move up the avenue, beginning with the teeny-boppers at 59th, the low-20s at 64th, the around-30s at about 75th, and so on. You can also find bars catering to singles, swinging marrieds, divorcees or homosexuals, to stewardesses, nurses and interns, joc...