Actually, lets do the math:
Assuming in a typical year, the amount of boys born is roughly equal to the amount of girls born and relatively constant growth rate…
if the typical age of guys getting married is… say… 22 (for arguments sake)
and the typical age of gals getting married is 18 (also for arguments sake)
and the population of Kiryas Yoel (chosen for illustrative purposes due to low influx and high birthrate) in 2010 was 20,175 and in 2000 was 13,168
then
20175/13168 = 1.532
1.532 ^ (4/10) = 1.18
which means that there are, based on the growth rate of kiryas yoel, 18% more gals of marriage-able age than guys of marriage-able age.
There’s your problem…
If guys are willing to marry girls that are two years older, we can alleviate the shidduch crisis almost entirely.