The Champ
All this 'not trusting' times doesn't make much sense. The timing systems used are very well understood and not prone to failure. Tracks are built to standard specification in terms of size and energy return. Wind gauges are calibrated and correct. At a meet run in any first-world country, these factors are all non-issues. Japan is probably the MOST reliable place to run a track meet in the world.
Also - in Japan it is virtually impossible to fake age. I'd be very surprised.
The only possibility for irregularity:
1)anticipating the gun - but I think they used pressure-sensitive blocks.
2) drugs - but in Japan this is hard to imagine.
He's probably just extremely good.