I think that when advertising as a provider, there are many things we lie about, like our name. I think false advertising would be, for example, a 40 year old woman who looks her age saying she is 25 and using pictures from 10 years ago. Obviously when you can't see the provider's face, if someone says they are 15 years younger than they are, it will be a disappointment when you show up to the date.
However, suppose a woman is 45 but looks much younger and is really petite which isn't something clients associate with milf or mature branding, and says she's 36, and shows recent pictures of her face, I don't really see what's wrong with that..
It's obviously different for spas and agencies because often they get to choose how old they age you on the website and that isn't the fault of the provider. However I would trust that a lot of owners don't go somewhere too unrealistic because they know it can cause clients to complain. I think a lot of clients who are overly concerned about age go to appointments being very suspicious and it may change the way you look at the person, you may start scrutinizing the person's face for wrinkles or signs of aging, which even people in their mid 20s can have (in barely noticeable ways).
Another thing to consider is that a lot of providers use cosmetic treatments like botox and fillers to make signs of aging disappear, and it may be shocking if you see someone the same age who doesn't have those enhancements.
