Likely also single.

Dating 40+ men?

Pure speculation, especially because most of this all is, but in keeping with wild assumptions:

They're divorced, after their high status husbands traded in for a younger model.

The solution seems to be for 20-something men and 40-something women to find some common ground. Hormone levels seem appropriate for that match anyway, as both groups are slightly past their peak lifetime levels.

They have a cat.

They're available. The male-to-female ratio drops precipitously as you increase the age band: https://public.tableau.com/views/PNWMatch_com/Match-PNW-Dash...