Acclaimed scientists Stephen Hawking, Michio Kaku, and others believe that an infinite number of universes exist; and that in some far future time, it may be possible to explore these other worlds, which many believe are connected by wormholes.
Theoretically lifespan will hit the dead end wall of the universe undergoing heat / expansion death. We can only hope that whatever intelligences in the next 50+ years do form that they will be able to work-around the infinite energy problems of making multiversal travel possible as I fear we semi-evolved simians won’t be smart enough for that little problem.
Alternatively, if multiversal travel is not possible the only other possibility I can think of is doing what some of the deluded and uneducated feard from CERN, that it would somehow trigger a new big bang.
If a small, localised big bang event (small only on a cosmic level!) could somehow be triggered from the vacuum then we would of course have a infinite supply of both energy and matter, ensuring the survivibility of life forever.