Does manual labour keep you looking young?

At my old job there were 3 people in their 70s and 80s who were more physically fit than your average 25 year old but all three had done manual labour for around 10 years or so - The 80 year old I worked with had fewer wrinkles on his face than a 19 year old guy I used to talk to at church every week and the 80 year old looked younger than him too - he told me he had been doing manual labour for over 25 years at the company 

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