Why bother with the age thing? Just put in a milf tag, and you wouldn't have to bother with a seperate tool.
I threw up a couple pics on that site and they were all 10+ years off too. No sure what op thought the necessity was.
I'm almost certain someone out there that looks like one of these generated women. I'm probably going to stop using the Humans LyCORIS just to avoid this. https://civitai.com/models/103848.
Or just... Use your eyes to tell roughly how old they are. No point fussing over details when it's not even a real person.