Honestly, I don’t recommend it. The drawbacks are much bigger than the benefits.
If you want a legendary high in your old age that also won’t kill you or make you an asshole, I highly recommend LSD combined with Nitrous Oxide. Turn the brain on with LSD, and turn the body off with laughing gas for 30 seconds at a time to ride in and out of pure creative consciousness. Works pretty well with MDMA too, but that can hit the stomach hard, and could be a bad idea for an older person.
Heroin will just remove all feelings of guilt and remorse for your actions until you subtly shift out of alignment with your own values. It removes all fear, which is what people get addicted to, but then you become a total piece of shit because you will feel no negative impact from being cruel. That’s the secret that I wish I had known going in. Don’t become a nasty tempered old junkie—that is a tired cliche and there are much better highs.
Not doubting, but do you have a source where I can read more about this?