> Everything we have witnessed that arises also passes away. Every living thing, every dead thing - even stars and planets - arise and pass away.

The context was if biological aging and age-related death can be stopped / prevented / reversed, and I don't see in what you wrote an argument against that. Those are a set of biochemical processes, and if there exist a scientific principle which would prevent modulating them successfully, you didn't name it.

> Moreover, why would you want immortality?

First, this is an orthogonal question. Whether I don't want something to happen, doesn't mean it can't, or won't: I never wanted to be replaced by LLMs, but those got invented anyway. Anyhow, the immortality we're talking about isn't of the kind where you are unable to die no matter what, it's just you don't age. You are permanently 22 - but so is everyone around you. I don't know, maybe it gets boring after 300 years, maybe after 300.000 - but I'd rather try and take myself out when I feel like it than die feeling there's so much more to experience (which is almost certainly going to be the case).