It's inevitable that a body living on a planet affected by its gravity is going to change. It has to. All we can do is work to prevent it from accelerating, and even with that there are limitations. It will not work on everyone.
We're all mentally, emotionally, experientially, and physically in different places. We look like the same creature, but the variables are nearly infinite, and that makes us different when we look at others. We should not judge where they're at, even though it seems natural to look at someone and try to figure out what's going on. We really don't know. We see things that are superficial, small components of who they are, and we automatically come to a full judgment. We say to ourselves, this is what's going on for that person, this is what they're like, and it's mostly incorrect.
The smart way to observe people is to look at them as a creature and an animal, not as some mystical being that's different from all the other creatures on the planet. All the other creatures are different from each other too, but what we have in common is that we are all animals and we are all reliant on the planet. We share chemicals and we're subject to mostly the same rules and laws of nature.
Every living thing must be born, and every living thing will die. Every living thing requires energy of some kind. Every living thing must reproduce, it has a mechanism for this somehow, otherwise that living thing would fail to exist as a species at the death of the first generation. Every living thing has a sequence of requirements. Every living thing has an environment it lives in to thrive. Every living thing has a diet it was designed for in nature, and the only way a creature deviates is if there's enough time for the change to take place.
Say something catastrophic happens. A meteor hits the earth and the planet goes dark for a thousand years, sunlight unable to penetrate the cloud produced by the explosion. Creatures that thrive in the dark would survive. Creatures that need light would not. Somewhere in the universe there are planets where plant matter could have appeared over millions of years of evolution, because the other foundations in the chemistry were right, if only they weren't bombarded all the time by large rocks, or if they had enough sunlight. With one thing out of sequence, life fails to form.
Earth is a really unusual place, because we haven't found life yet anywhere else. It might be out there, just too far away. Some life on other planets might be only two or three hundred years behind us technologically, so they don't have the ability to reach out. Some societies might be a thousand years behind. Some could be a billion years behind, or a billion years ahead. What would life look like and be doing a billion years from now on this planet is anyone's guess.
We assume a life form that advanced would seek out other life forms. But how do we know they don't already have the technology to know we exist and simply don't care? We have no meaning to them. We're nothing more than a tiny marble with little specks of bacteria on it, so why would they need to study it? If they're that smart, they have math that describes the probability of human existence on a planet like earth, and they would know almost exactly what we'd be doing.
Anyway, it's neither here nor there, because it's not present moment stuff. We don't know anything about it. It's philosophical conversation, and it doesn't lead anywhere. It's just designed to put some perspective on what our activity should look like, considering the short period of time we live on earth and what our limitations are as creatures in general.
The best thing you can likely do to live a long time is to live on through the next generation, by teaching a lot of people good things. And there are infinite ways to teach. My daughter's kindergarten teacher might not be teaching spirituality directly to the next generation, but she really is, in her own way.