They’re not.
A quick google search:
In Japan, roughly 50% of young adults aged 18-29 report being virgins.
In the UK, about 46% of people aged 16-24 identify as virgins
10% of US males under 34 are virgins. (Source)
EDIT: The OP seems to be citing data from at least 15 years ago. But that’s precisely the problem: the world seems to have changed in that time. We have 3 times the number of virgins across age groups in just a few years, for instance.
deleted by creator