Men and other mammals live longer if they are castrated, says researcher

Cat Bohannon tells Hay festival audience it is not known why men go through life smuggling two little death nuggets'

Whether it is the fountain of youth or the elixir of life, men have travelled the world looking for the key to increasing their longevity.

They should be looking a bit closer to home, according to one leading researcher - although after they do, they might end up taking the years God intended for them.