I do not believe that there is any hard and fast rule around age. Simply contact the provider you are interested in via e-mail and state your profile. Age, height, weight, etc. She will let you know whether or not she will see you. I think every provider has their own standards / limits as to who they see and who they do not. Hope this helps.

Appropriate is whatever you want it to be when you are paying for it.  As long as the lady is legal and is comfortable with seeing older men there will be no problem.  The fact is most providers prefer older guys.  Age is relative however and some gals do have their own preferences and restrictions-usually a minimum age rather than a maximum. You will want to be up front with the lady that you plan to see.

Many ladies state that they prefer us guys to be over 30 before calling.

As for seeing someone half your age, I would say go for it.  I've always been welcomed with open arms and legs by the younger ladies under age 25, so don't let her youth discourage you if that's what you are into...

Hell, if your 50, just get a couple of 25's...problem solved. Seriously, no there is no age limit for most ladies. They seem to prefer that we are a bit older, and that's a bit of information that I was very happy to hear. In fact, you'd have more of a problem finding a lady to see you if you were younger.

I saw my first provider at age 58, I'm 62 now, and she was about 3 months shy of 19 when I first saw her.  I saw her again shortly after she turned 21 last year.  She still is the youngest I have seen, at both ages.   I have seen numerous girls less than half my age, younger than my sons, and have no problems with it.

The too young stuff is only applicable if you are 36 and she is less than half your age, as was already mentioned.

However, most of the women I have seen tend to be in their 30's and 40's.  I have had fun with all of them, regardless of age.

But I would not be too concerned about the age thing.  They know what you are there for. If it really bothers you, then find a provider closer to your age.

Swim

One of my regulars is about half my age, so I would say, definitely appropro.

you will not have a problem seeing a girl half your age.  If you do a search for young providers you will find several threads discussing the pros/cons of seeing a younger gal.

I just enjoyed an interlude with my first 18 year old, I was a virgin until me and my first were 19, sort of.