His team’s survey found that 13.9 percent of men and 8.9 per cent of women said they have never had sex.
That being said, I think a fair number of people are just asexual—very low sex drives.
My guess is that percentagewise the proportion of virgins is highest in the 25 to 30 year old bracket and lowest in the 40 to 45 year old bracket.
I had a great-grandfather who married for the first time at 42, remarried after his first wife died, and fathered 8 children in all. He died long before I was born and I have no idea as to whether he had any sexual experiences before his first marriage.