In his column last week, the respected Newsweek columnist Robert Samuelson criticized the selfishness and cynicism of “older boomers (say, those born by 1955).” I don’t mind being criticized as selfish or cynical (after all I live and work inside the Beltway), but I do question the older boomer label as applied to me. After all I was way to young for Woodstock! I was even surprised to learn yesterday in the Post that Grace Slick (who performed at Woodstock — I saw the movie) is alive and painting. I thought that she had met the same fate as her friends, Jim Morrison and Janis Joplin.