If a bacterium has enough nutrients to live, it will probably divide
into two daughter cells. If not, it will probably form a spore casing
that can be revived later on, as in the case of Bacillus or
Clostridium. They can live for centuries, as evidenced by the
"discovery" of bacteria from the ancient Egyptian tombs.

Bacteria reproduce by binary fission, meaning one cell divides into
two. Would you consider both of the cells new? If so, you could say
that a bacterium can live forever by dividing itself into infinity.