At major USATF masters meets, athletes age 25-34 compete as submasters — a great way to introduce the kiddies to our niche. But the national committee that runs adult age-group sport has been made up of mostly 50-plus folks. Until this summer. For the first time in my vanishing memory, a submaster has joined the USATF Masters Track & Field Executive Committee. Landen Lama, a Washington, D.C., resident who doesn’t turn 31 until November, was named interim treasurer in late June. He succeeds Mike Travers, who resigned for still unexplained reasons. (He never replied to my email queries.) In mid-July, I reached out to Landen and others, seeking more info on the appointment. MTF Chairman Robert Thomas didn’t get back