@belxebu The magazine we see the year on was from 1997. If the photos were taken that year and she was 18, that'd have her turning 41 in 2020, but she could also be 40 depending on when her birthday is. The daughter's 10, so she'd have been 30 when she got pregnant, which isn't terribly unusual and her design looks like she could easily be 40/41 to me. The art goes out of its way to show us the moles on her face, including a nice close-up on page 5. I do think it's supposed to be her, and it definitely explains Nanami's behavior toward her mother. At the very least, I'd say Nanami
thinks it's her mom in the magazine.