1) Instead of getting sick and feeble, enjoy your health until you've had enough, then take up free climbing or wing jumping, and enjoy that until you go out with a bang.
2) Save your money, and periodically take a sabbatical for a few years.
3) Find a job that doesn't seem worse than slowly falling apart until you die.
Don't be fooled by this idea that those individuals have any real power.
They are in a silent contract with the aristocracy around them, and the same process repeats all the way down the base of the pyramid.
The only reason it is difficult to get rid of tyrants is because a large amount of people in their countries benefits from this arrangement.
> The Hitler issue would never be as easy as killing baby Hitler.
I agree that killing baby Hitler wouldn’t help, but that’s not what’s being discussed.
A stroke-free Stalin would have been an issue.
Extreme environments lead to extreme leaders. I’m not sure that giving unlimited time is a good idea, as that would seem likely to cement a situation permanently.
An eternal Putin might actually value life more than the current one does. Being ageless doesn't mean you're immortal. He would be even more worried about assassination than he is now.