NEEDHAM — The other coaches know it. Even the referees know it. Bundled up in a jacket at least three sizes too big, in a pair of 7-year-old ­adidas Sambas that have been chewed up by a 5-year-old springer spaniel named Corky, Don Brock doesn’t need to be on a soccer field in freezing temperatures.

The 76-year-old, blond-haired man has nothing left to prove. He’s been coaching for more than 50 years, 46 of them for the Needham High boys’ varsity soccer team.