He is arguing that he liked being young, and things have changed, so rather than accepting that he is old now, he has decided to attack everything which has changed since he was young and "happy."
Except that in my experience, people who aren't happy when they are old didn't appreciate life when they were younger, either.
I am pretty old---not Rydabent old, but pretty old. I have learned that life is a one-way trip that gets shorter every day, and the slope gets steeper every day as the mind and body get weaker.
I am learning that I need to accept this, and adapt. And I have learned that not taking most things quite so seriously is a good start. If I go out to ride and my bike has a flat, no problem. At least I am still continent and ambulatory. And when I am no longer ... I will wheel around in my Depends in my wheelchair and try to enjoy what i can on that day.
I think Rydabent must have learned all this long ago---which is why he posts these subtly ironic and very humorous posts about how "everything was better back in the old days .... "
Yeah ... there is no way a man of his wisdom and experience could take these poss seriously .....