The Japanese runner finds age no barrier and may even challenge the world record she already holds in Monday’s Boston marathon

A niggling knee injury and just one full day to recover from a 13-hour flight across as many time zones are mere inconveniences for Mariko Yugeta as she prepares to compete in the Boston marathon, and beat her own world record again.

The Japanese runner will line up in Monday’s race alongside women half her age, and they will do well to keep up.