Moses, so we are told, was 120 years old when he died, and “biz hundert un tsvantsik” – [may you live] until 120 – is an old blessing. The joke it gave rise to is probably just as old: Harry is fed up with his noisy neighbour, so he confronts him: “May you live to 119!” he says to his neighbour. “May you live to 120!” he says to his neighbour’s wife. “Why the difference?” asks the neighbour. “After putting up with you, she deserves a year of peace and quiet.” is the reply.
Whilst pension scheme actuaries are not yet assuming that schemes will have 120 year olds, most scheme funding assumes that some pensioners will be receiving their pensions well into their 100s. This is the case even though the latest mortality tables show a slowdown in the rate of increase of longevity.