>>12338013There's no such thing as dying of old age. It's just an expression.
There's no law of science that prevents you from living to be 300, 900, or even a million years old. Sure, your odds of living to those ages are infinitisemal, but if there are infinite universes it would have to happen somewhere.
And it's very unlikely you'd be in good health at such an old age. You'd probably be continuously coming infinitely close to dying without actually dying.
And forget about euthanasia, since you'd just end up in the universe where you survive the euthanasia attempt.