We Can't live a Thousand Years Now?

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​ Adam & Eve were immortal until the fall. After that, it seems that people could live around one thousand years or close to it. Does the Bible say nobody could live longer than a thousand years before the flood?
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After the flood, did God say people will live about 125 years but not more than that? What does that mean? Is that the maximum length or an average or a minimum?
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Before I asked about if starfish genes are already in humans since the creation.
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Now, I want to ask why or how are people limited to only 125 years.
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It seems that the earth had a green house water sky ceiling sun filter which blocked the bad sun rays maybe and helped people lived longer and it is apparently not here now.
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Is that the only reason why we live shorter?
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Isn't our cells able to split and regenerate for at least one thousand years still like right now?
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I would say that we would not live as long if the earth is more polluted and no longer a green house and as the soil depletes and as we do bad things and as we do not eat healthy and as DNA declines through the generations perhaps, but by ten times?
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Our lifespan is about ten times shorter than before the flood.
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Did God really say we cannot live 200 years or more now?
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Didn't a Japanese or Chinese man live for about 200 years from the 1600's to the 1800's and therefore lived longer than what God sai we could live in the Bible of 125 years or so?
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I believe that our cells are still design to regenerate for at least a thousand years and I believe that people can live at least one hundred years if not much longer. I strongly believe that humans can do much better than they are doing. If all the problems reduced our lifespan by half (50%), then we should be able to live for about 500 years now still. Why not?