There is no physical/chemical/biological reason you can’t live indefinitely with the health and vitality of a 25-35 year old. Aging isn’t a law of nature.
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In fact we know how to live forever, control our telomeres. We know it works because cancer exists. We just can’t control it but controlled cancer is effectively immortality.
Lobsters aren’t truly biologically immortal. They “continue to grow throughout their lives,” with “increasing amounts of energy” being needed to mount ans they grow larger [1]. “Eventually the cost is too high and lobsters can die from exhaustion.” (That said, if our cells aged like lobsters we’d live something like thousands of healthy years.)
For true biological immortality, look to some jellyfish [2]. You literally can’t tell if a cell is taken from an old or juvenile.
[1] https://www.nhm.ac.uk/discover/are-lobsters-immortal.html
[2] https://www.nhm.ac.uk/discover/immortal-jellyfish-secret-to-...
Technically “immortal” means “never dying”, it has nothing to do with age. You could be unable to die but continue to age and become ever more decrepit (although the Oxford dictionary does list “never decaying” in its definition), for sure there’s a sci-fi short story about that out there.
The mentioned creatures all age, they do get older, it just so happens their bodies don’t deteriorate, or they do but regenerate.
Hence my use of the term biologically immortal.
> mentioned creatures all age, they do get older, it just so happens their bodies don’t deteriorate
Were you really confused that OP was talking about stopping physical time?
That’s the second paragraph. I was specifically addressing only the first (the one I quoted). In that one you seem to be saying that “immortal means not aging”. That’s the only part of your post I wanted to address, the rest was very clear.