I cannot find a frame of reference for that but a whole marathon a week (even if taken in slices) must be good at any age. At school I did 5 miles a day plus 10 at weekends. Since then, I fear, that has been more pints than miles and my knees now don't agree to me walking to the newsagent let alone running.
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David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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