re: What age did you older golfers move up to white tees?

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For example, if a 10 handicap played every par 3 from 100 yards on the tee box, hit their 2nd shot on every par 4 and third shot on every par 5 from 100 yards they would average 81

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This is true.
There is a better chance for the player to break 80 once tee up, but it does not make 18 shots easier. Most 10 foot putts are missed- by tour pros. Dispersion for a tour pro on a given shot is 3% when playing well.