Here we describe the most interesting stars for humanity and its future:
Oldest Star to be copied:
http://en.wikipedia.org/wiki/HE0107-5240 http://en.wikipedia.org/wiki/HE1327-2326
Copied, I mean we need to create a star as old as that or to study how to make a star immortal while providing energy.
Or maybe we won't need the energy of the star just the material of it so then here I provide some of the biggest stars discovered so far:
http://en.wikipedia.org/wiki/Pistol_Star http://en.wikipedia.org/wiki/Eta_Carinae
Maybe with advance in the bionics field, we won't need stars any more.
There is also another scenario where people are saying that the universe will die and becoming cold and that matter will be liquid. Intelligence will adopt this kind of shape to achieve immortality.
Good text about that:
http://www.aleph.se/Trans/Global/Omega/dyson.txt
--Jon