Most Yeshivishe girls today don’t get engaged by 19 as they are in seminary or pursuing a degree and girls these days, many Chassidishe included, are generally more picky so it usually takes a longer time to find the right one. But still, 24 year old boys getting engaged to 20 year old girls is for sure contributing to the shidduch crisis.
In some Chassidishe circles girls are not in a rush to get married and they get engaged by 20 or 21 and oftentimes the boy is younger by a year or so. In my opinion if this trend continues, there will be a glut of “older bachurim” of age 21 and older years of age on the market. Its a Chassidishe shidduch crisis looming in some circles h”y if this trend continues. This upcoming trend excludes Sqvere, Monsey Viznitz, Satmer where the boys and girls generally go at a younger age of 17, 18 and 19 and they are generally not as picky and have “old-fashioned” ideals of kids marrying as soon as possible which has both pros and cons. Of course everything is bashert, but there are trends of thought patterns in each generation and I personally think that although going too quickly is not ideal ( although many are very successful with this shittah) girls going later age of 21+ in the Chassidishe oilim and Yeshivisha boys starting shidduchim at age 24 is playing with fire.
Although to be honest my daughter-in-law is a year older than my son, when I did the shidduch I had no clue that this is a new Chassidishe trend, but it she is the right girl for my son b”H. Shidduchim are bashert and the bottom line is that we don’t have much say even though we think we do, but it is also the truth that if this trend continues it is a shidduch crisis waiting to happen because by the time girls are ready to get married at age 21, there are boys years 18+ on the market so the pool of boys become bigger and the boys that are a year or two older than the girls have a smaller chance of finding a shidduch.
Again, everything is bashert and everyone should do what is right for them, but trends where everyone does the same thing is still dangerous.