There are 1000’s of older unmarried bachurim as well, nassi is wrong on many accounts. Men have always married woman that were younger than them, not only in the Jewish world, but also in the goyishe world, this is natural. There has never been such a shidduch crisis during peace times, this is unnatural. It is not because of the age gap, and the crisis is not unique to woman. There are several reasons for it, but I will not elaborate now. First people need to get their facts right before they can analyze and theorize.