So this question is something I need to brainstorm, for a project I'm planning on. Its inspired by evolutionary biology and how circumstances defined by nature, has the potential to generate practical solutions that are still not properly understood. Things like the gecko's adhesive feet and the bats sonar capabilities are good general examples.

Those aren't what I'm aiming for however. The animal trait i'm inspired of, belongs to the jelly fish Turritopsis dohrnii and It makes me think in this way:

There is arguably a distinct evolutionary advantage to mortality. It opens up room for the next generation, and it allows for evolution to happen at a much quicker pace than it would with members going on and on for ever. In fact, its not until a species mind is fully cultivated one can talk of the advantages of old age over that of giving way to the next generation.

So what causes a very select few species to live that much longer than others? Old age does not seem to be limited by biology itself, but rather, by what process of acclimatization that species has gone through. Right? So I ask this question: Could humanity, theorethically, self-impose a set of limitations and circumstances, that would mimic a natural process/setting, that would in turn grant biological immortality?

If so, what kind of process would this be? Encouraging marriage later in life? Looking at old age and longevity as a preferable trait? To such a degree, that we eventually evolve people that just dont die of old age?

I would absolutely love input on this, for my project of course =)