Steroids are bad for you, but Arnold and the gang used somewhat reasonable amounts (relatively speaking), which is probably why Arnold himself is still alive, though he has had heart problems. Steroids do a real number on your blood vessels. Usually not instantly fatal, but they'll steal years off your life. Later bodybuilders took way too much and combined them with extreme diuretics regimens and other drugs that destroy your kidneys and liver, in addition to the steroids, combined with extreme overeating using Insulin. It's just a recipe to die young, and so they are. Some are dying in their 40s or even younger. Insulin is probably one of the most dangerous drugs to abuse. One slip up and nobody can save your life, it's that deadly.
I still remember the owner of the local gym wheezing like an 80 year old emphysema patient after climbing the relatively short staircase, due to his extreme abuse of trenbolone. I swore to never touch any steroids after witnessing that. He looked like a Greek God, but his insides were all rotten.. Some of my friends startet using them, but I kind of lost touch with them. I really wonder what their health is like now.
I think the key to an healthy old age is to stay relatively slim. Moderate excercise, and a reasonable diet. I'm only 43 but throughout the Corona time I stayed relatively sedentary and gained a lot of weight. I felt like absolute dogsh.... When I tried playing again, it didn't go well. I had trouble with everything, but I believe my poor physical condition had a lot to do with it. I'm on Paleo now, losing weight and feeling great. Everything works better, my body as well as my brain. I also started taking cold showers, as it is claimed this has many positive benefits for the problems I have with various inflammation related health concerns. I hate it, but after it's over it makes me feel really great. Before cold showers became the new hip thing, I learned that a friend of the family, who is now in his 80s and still extremely fit, had been doing it all his life. There is real also scientific proof that it has benefits. I'll stick with it, I think.