PHILADELPHIA — In April, Richard Glazer, 82, will put on his blue shirt and start his 28th year as a baseball umpire, now with the Tri-State Elite Umpires Association, officiating high school games and men’s semi-pro games within a day’s drive of his Cherry Hill, N.J., home. He is certain he is the oldest umpire of this group of 500 officials, and he suspects he is the oldest active umpire at …