I am speaking in general, not about any particular spa or girl. Most of the time, I may have to add 5-10 years more to the advertised age, including at upscale spas like Flirt. After hobby for a while, I accept this not-so-good practice. As long as I have good fun with the girl, never mind! I know some very popular girls are in their 40s or late 40s; many say these girls are hot and crazy about them!
Frequently, the girls may paint a nice picture of their job besides in a spa. They could tell you that they have a professional job or studying. For me, who care.
Also, anything can happen inside the room; no one knows except the two involved parties. Some guys reported advanced level game with Sophie but I have got nothing so far and getting less upon my return to see her. But, I would not complain (I just would not see her again). That's my approach/view after being in the hobby for this long.