We're all aware of the limits that menopause places on female fertility. But we're perhaps less concerned with what happens to male fertility past middle age. With movie stars Al Pacino and Robert De Niro welcoming children at 83 and 79, respectively, it's easy to assume that age is no barrier to becoming a father (the official record stands at 92). But is it really that straightforward?
The age that people become parents has been rising since the mid-1970s and is now