Two hours of cardio and one hour of weights 4-5 times a week?
First off, that sounds like torture.
Second, two hours of cardio is most likely wiping out any muscle gains from lifting.
Third, something has to be off on his diet or hormones/body if he’s torching calories for 2-3 hours 5x week and not losing any weight.
On a side not, I’m actually most surprised that a 62 year old has the endurance to do a three hour workout once, let alone 4-5 times a week.
I’m 46 and my strength has only slightly deteriorated, but I noticed around 43-44 that my endurance levels started fading much more rapidly.