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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We don’t know this. We know of no creatures as biologically complex as humans that demonstrate biological immortality. That might be because nature never bothered. It might be because it can’t.
But you are generally correct: we have strong evidence healthspan-increasing interventions are not only possible, but proximate. That research could move faster with more funding, particularly from the public, since if we relinquish this funding to the rich it will not prioritize treatments which may be slightly less effective but much cheaper and thus broadly applicable.