Since at least the early 1970s, when he worked with Track & Field News as master of stats, Peter “Pete” Mundle was an expert on records. He kept single-age bests for all events, starting with sub-kiddies. Eventually, he confined his attention to masters. His hobby led to annual publication of Masters Age Records. They were unofficial but engrossing. Now his last 23 records booklets are online here — at mastershistory.org. L.A. resident Pete, now 90, gave permission for posting of the archive. National Masters News, which published the books until the last one in 2006, also gave its OK. They…