A theoretical future point in time when all of the medical conditions that cause human death will be eliminated and death would occur only by accident or homicide. A blend of Methuselah and singularity; coined in 2010 by Dr. Aubrey de Grey.
Once we reach the Methuselarity, we will live in a world where 400 year olds are getting spanked by the local 600 year old, 300 year old basement dwellers leech off their 330 year old parents, and the family 900 year old who makes the most in pensions and Social Security will outtalk everyone at the Thanksgiving dinner table and tell the entire family how things were better back when he was in his 200s.
Methusalem is a term for a wine bottle size in champagne. It holds six liters, which is nearly 1.6 U.S. gallons.
The methusalem (or methusalah) bottle has the shape of a burgundy wine bottle, that is, from its cylindrical bottom it tapers gently (doesn't have "shoulders" as a bordeaux wine bottle does) to its top.