The only issue is the math. If you believe that boys can marry girls significantly younger than them and still have everyone get married you might as well get on a loudspeaker and announce that 2+2 = 17 You are unfortunately mathematically challenged. It has zero to do with FFB, off the derech, baal teshuvah or anything else – just simple math. If an older (smaller) population is predominantly marrying into a younger (larger) population -there can not be enough girls for all the boys. So yes 2+2 remains 4 and if you don’t believe this I do feel bad.
