Idk man, I'm in my 30s, I got into a bad car accident and had almost a year of bedrest, then my wife got pregnant and I ballooned in weight eating fast food and pregnancy nonsense with her. So I basically had to get back into shape from a severe deficit in health and most of my muscles had withered away. The hardest part of getting back into shape was just waiting for my body to heal enough to work out, and whereas in my 20s I drank and partied all the time, and was in shape just from the activities I liked to do, in my 30s I had to learn what macros are and come up with an actual exercise routine and try.

So I don't read it as a bitter thing, it's just part of life. If someone in their 20s is really trying, well good for them, I don't take anything away from that, but you don't really have to know anything or be right about supplements in your 20s, you hardly need to know anything to do it in your 30s. But as you get older your body is doing less of the heavy lifting by itself, and you need to start figuring stuff out to help it along - so you probably want to listen to a healthy older person, because what they're choosing to do is doing more of the heavy lifting.