Ключевые слова: 400 m, 75 years, action, adult, age, aged, athlete, athletes, body, competition, competitive, elder, elderly, grandfather, gray, jogging, male, manmetro, masters, old, older, outdoor, pensioner, person, race, retired, run, runner, running, senior, shoe, speed, sport, sprint, sprinter, sprinting, stadium, start, summer, track,