[antisthenes]

That's a valid complaint, in that the body generally experiences a somewhat rapid slowdown in metabolism around the age of 25-26, but after that it appears to be a relatively slow decline and is definitely no excuse to let yourself go.

To give you another data point, I've started a similar exercise routine around 27 and have kept it up until ~29, and while it has gotten harder to maintain the same weights, I still feel great.

Certainly better than my younger self that did no exercise at all and led a completely sedentary lifestyle.

It follows the tree quote: the best time to start exercising was "x" years ago, the 2nd best time is now.