Varies depending on fitness, literally.<br />
People tend to slow down as they get older. The less they do, the more they lose fitness. The less fit they are the slower their metabolism becomes. If they keeping eating the same amount but not burning up the energy, they put on weight. More weight slows the metabolism further and makes the person feel more tired and want to do less. Vicious circle.<br />
The only way to beat it is to keep exercising even when you don't feel like it.

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It depends on the person, there is an age related element but that is not a really big factor unless you take extreme ends of the range

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thanks

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