Post older female characters attracted to and falling for younger male characters

Sayo from Recorder and Randsel fell for her best friend's little brother - who happens to be an elementary student who looks like a high school student or adult.

Ms. Kazumi from Please Teacher! She falls in pag-ibig with Kay Kusanagi, one of her students!

Canaria Utara for her childhood friend Ichiya Suzaku from Qualidea Code.
Well, she used to be a taon older, but Ichiya was woken up from cold sleep a taon before she was, effectively making them the same age.