The setting is a horse race track. The young man weighing-in has a jockey cap under his arm, but is wearing a military(ish) outfit.
There is another military-type individual to the far left of the frame.
I don't know; it's pretty typical for a jockey weigh-in photo, but the military theme might place it during WWII. Themed shots like this lost popularity rapidly after the cessation of hostilities, so I would be inclined to date it 1941-1945 or so...
You might get one of those local SF "on your side" TV reporters interested as a fluff piece; "Where is he now?" and "Who is he?". Just be prepared for a flood of crazies claiming to be the kid!