.. But your statement about the age at marriage is wrong, at least for Western Europe since about 1400, which has had late marriage and uniquely high proportions never married. If you haven't fact checked your demography assumptions, you are probably wrong.
The story that Jesus was unmarried was probably promulgated by the Roman Catholic Church, with it's uniquely weird attachment to celibacy. Which, of course, has affected Western European demography in many complicated ways.