That is excellent that he is still running 10Ks at 85, at one of the parkruns I go to there are 2 men who are in their 80's and two others who are 79 and still running sub 35 minute 5Ks, so by next year there could be as many as 4 men running at that parkrun who are in their 80's.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.