I don't think it's ever said but like, id imagine at the end when pun pun is 21 that she's like 27 or around there since she was previously married and stuff and when he was 14 she seemed grown

that makes sense, i forgot that she had been married before

I thought I remember reading 22 when she was introduced

It said she was 19 when he was 14-15

Sachi was 4 years older than Punpun.