I think the part about how the uke is only into older men because he's only ever pursued those types of men and the origin of that probably is that he never had a father figure is pretty realistic. I've read a lot of bl with a similar premise (I cant date you because...) but I find this to be relaxingly simple and real.
Gosh I've been so sick of the garbo plots in BL lately, even if something seems like an interesting premise the mangaka can never seem to put in the effort for a comprehensive plot. So this is really refreshing to see.