far vos: If NASI is successful in its goals, it’ll cause the average age of girls getting married to be older than the current average age of girls getting married. But it won’t cause some of the current younger girls to not have a husband; it’ll just cause them to get married at an older age than they would have under the system as it stands currently.
You wrote: “NASI’s idea will work only if EVERY person marries someone born in the exact same year.”
Actually, all that is needed is for the AVERAGE age gap to be about zero. So one chosson could be 5 years older than his kalla, while another kalla could be 5 years older than her chosson. That would eliminate their being too many girls and too few guys for them to marry. BUT even if that goal is not entirely achieved, but the average age gap is just REDUCED from what it is currently, then it will still cause a lower percentage of girls that won’t have who to marry than the current system causes. Which is an improvement over the current system, even if it doesn’t resolve the problem 100%, it might fix the problem -say- 85%.