Oh I hear you on the increase on requirement for more protein to maintain muscle. My Dad at 96, 97 soon, told to take more. Full fat milk back on the menu for him. Resistance training as well, feels like young folk might carry that on with the amount I see going to the gym. We can certainly get it from other sources, just not as tasty 😉
May see an Uptake in protein shakes in the older people, maybe.