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Recent studies of precision electroweak observables have led to theconclusion that a fourth generation is highly constrained. However, we pointout that a long-lived fourth generation can reopen a large portion of theparameter space. In addition, it preserves baryon and lepton asymmetriesagainst sphaleron erasure even if $B-L=0$. It opens up the possibility of exact$B-L$ symmetry and hence Dirac neutrinos. The fourth generation can be observedat the LHC with unique signatures of long-lived particles in the near future.

Saving fourth generation and baryon number by living long