So he's dieting, exercising regularly and getting a full night's sleep.

This, they measure, is beneficial.

Not exactly shocking here. The only big change in "biological age" is the lung capacity, but obviously anyone who exercises daily and does high intensity workouts is going to have drastically better lung capacity than the average joe on which "biological age" is based.

They seem to have no real results beyond the obvious healthy living techniques humans have known for millennia.