How long does a sevrum live? I own a gold sevrum that I bought as a 1 inch juvinile in 1997 and she is still alive/swimming in 2010. She (egg layer) survived her mate who died a few years back. Both lived in a 35 gallon hex where they tended eggs with no success the whole time. I moved the two of them 475 miles across wyoming in 1999. She remains alone in the 35 hex in a quiet area of our home. So what I am saying is, they can live 13 years so far.