American 'biohacker' Bryan Johnson claimed this week he had managed to de-age his viagra 6 car penis thanks to his controversial rejuvenation methods.

The longevity entrepreneur, who is 47 but claims to have the 'penile health' of a 22 year old, says monitoring and measuring night-time erections is one of the most important markers of men's health. And because of his efforts turning back the biological clock, his erection health is comparable to that of his 19-year-old son.

While a little out-there, his comments echo research that shows men with erectile dysfunction are more likely to suffer other medical issues.

Last year, Mail+ columnist Amanda Goff spoke to a man in his sixties, Phil Escott, who says his radical diet gave him a new lease on life - in more ways than one - and it didn't require expensive, high-tech biohacking techniques.