But he is far more likely to entice female mates than a younger man with a similar sports car. In other words, any stag that can still display a fine set of antlers in the twilight of its years, or an old peacock that can still rustle up a first-rate plumage - or an ageing Lothario who can still sport a Rolex and a riverside apartment - has to be considered a major catch. It is, says zoologist Stephen Proulx, a matter of genetic strength. Why not the other way round? However, if she can pick an old male who can still display she knows she is onto a good thing. Such displays, in the elderly, are unconsciously reassuring to women. The theory therefore provides a new answer to the question: Share via Email An ageing male flaunting a new Porsche may be the butt of derisive male jokes. Only a creature with really powerful genes can do that and therefore attract females who are, in general, the ones who choose partners while males wait to be selected. In other words, in our evolutionary past, when people generally pegged it in their twenties, the fact that a man made it to his sixties indicated he must have something very powerful going for him genetically, a trend that still produces biological effects. A younger male may do so, but a potential mate does not know how long he is capable of maintaining that ostentation. As the saying ran: That is the surprising conclusion of zoologists who believe they have discovered the secret of one of society's most baffling mysteries: They are scientific just-so stories that you can use to explain almost every human attribute - from acne to zoophilia. As a result, Proulx has put forward new findings in the Proceedings of the Royal Society - a theory that combines both the ideas of wealth and male longevity.