PM:
Buy only having 60 boys getting married in the second year, you are having more boys avalible from that year than girls.
A revision to the Mashel is that 6 boys & 1 girl swim home (go OTD), 10 boys decide they don’t want to get married and will wait 2 or three years in the hope they get saved (earn a parnassah or continue learning. I know a number of boys who are 24 who are still not interested in going out). 40 boys will only go out with girls who got washed up with cans of food, of which there are many, but not all (lets say 65); 15 girls without cans of food state they only will marry the ones who want girls with cans (due to the boys wanting to learn all day & not worry about parnassah). Some will only go out with those who have a well (life support). Then you still have the imbalance. The conditions go on & on.
Its much more complicated than you would think, even without the “age gap”.