I list as 48, which is my real age. I occasionally play with the number to make myself anywhere between 38 to 52, but that's more for my amusement and to see if it makes any difference to my sales or profile hits. I tell the truth if anyone asks (which is rare, and usually on cam when they haven't read a thing anyway). I have also, like the OP, had comments from clients saying that I looked too young, they wanted a "mature" lady, or MILF, but I didn't appear old enough for their tastes, but this was before I showed my face anywhere. They were presuming that "40" was actually "50" and didn't even factor in different facial types either - I have a "resting bitch face" but when I smile I apparently can look quite "cute", which can take years away.
So yes. Most of the time it's my real age.