I am 60 and felt fine into my late 30s, and even then the changes happened slowly. Our world has become more toxic, and you are suffering the direct results. Some are luckier than others, but you are correct that things have changed for the worse. Plastic is a likely main contributor but there is a lot more crap in your environment than there was when I was 20. It breaks my heart that it should be so. I hope the future has some remedy.
I am 60 and felt fine into my late 30s, and even then the changes happened slowly. Our world has become more toxic, and you are suffering the direct results. Some are luckier than others, but you are correct that things have changed for the worse. Plastic is a likely main contributor but there is a lot more crap in your environment than there was when I was 20. It breaks my heart that it should be so. I hope the future has some remedy.