Let me say this again, what is human life expectancy, not politician or pilot life expectancy? Just your generic human.
I don't have an answer, as like most of the things in Elite's lore it seems finding any real answers is a complete pain in .
(oh, hey, pointless censor that doesn't ever match the culture of the game itself! we meet again... )
But, to be fair, the answers to many lore questions are quite similar, i.e. it boils down to 'not much different to how it is in our era'. In the context of life expectancy that means there will a huge range across different systems and worlds, depending on socioeconomic state.
Mahon is, I think, the oldest leader at 114, and he barely looks in his 40's, just as Winters is in her 70's but looks around the early 30's. Doesn't seem as if we have details on who uses p-cells and who doesn't, so it's hard to suss exactly who's using and who's au natural. Some instances could be genetic, i.e. some people are less viable for the treatment, which could explain why Hudson, for example isn't exactly looking good for his age relative to some of the others.
Given the text for the progenitor cells ("Some cultures believe it is immoral, especially as they tend to be used by the richest people, and so they are illegal in some jurisdictions"), it's reasonable to speculate that ED's life expectancy isn't linearily commensurate to the kinds of broad predictions that see, for example, average lifespans to top 125 by 2100. Who knows where the general upper limit 'topped out' in Elite.
What's the question for, btw? Any reason, or just random curiosity?
I RP a character, and I've simply gone with her being in her mid 30's, which makes sense given her backstory, and would fit just fine into most visions of how education, career, and life stages roll by in 3303 given what I know of the [frustratingly patchwork, hard to pin down] lore. None of older relatives would use p-cells given their demographics, so I'd just roll with her parents - and her own - lifespan to be around 100 years.
If the gap in wealth keeps widening - and everything suggests that to be the case - by 3033 the
average wouldn't be that high at all, given the sheer volume of people living in various forms of deprivation. After all, as some have remarked, in many ways Elite's universe is dystopic.