AZ, one question about lowering the age:
Most of the men I know in their young 20s are no where near ready to get married. They wait until 24+ to be stable human beings. Women tend to be ready younger. Lets say 25% of men and 75% of women are ready at 21 to date/marry. Using your 100/150 numbers, there are 25 men there are now 113 women vying for them if you want to stay in the same age range. Doesnt that make it even harder?
Is the shidduch system broke? Absolutely. But maybe its time to re-implement polygamy if the numbers are that skewed (which, I honestly don’t think is the case)