I never dated til 25 either, but not by choice. I repeatedly asked and was rejected. At the time I owned 6 apartment buildings and lived in them. I knew the intimate details of the lives of all of my tenants. 50% were unattached women. 30% were unattached men. 20% were married (ceremony or common law).
After continued rejections age 25 to 30, I began an intensive examination of the subject, talking with large numbers of people, including literally hundreds of current and former tenants who had talked with me in the past about their intimate decisions.
I formed my opinions then and have found them to be generally consistent with subsequent observations. Of course, there are exceptions.