I am new to all of this and was wondering who generally meets with these women (older men?)  and is the billing process fairly private.

Which "these women" are you referring to?

There is no hard and fast rule.

Billing....??????!!!!!

Cash is King!

Pay with cash only. If you do not have it, don't hobby. Cash leaves a minimal trail that can lead to you, credit cards do.

There are hobbyists of many ages, but most appear to be in the late thirties and older, although some twenty and early thirty somethings occasionally post.

I'm 33 I started to hobby on a regular basis in May of last year.  I saw a provider for the first when I was 25.

35 and up and married although there are plenty of exceptions. Yes, always CASH.

Depends on $, the more u have the more exploring, it is a hobby remember that! don't mortage u future, instead get help! Have been told on many occasions, older gentleman are most likely to be seen more often, frequently have been told I'm the rare one, younger guys don't have funds for this!

First of all, I'm not the newbie my name implies.  Second, I started this when I was barely old enough to legally drink.  That was 7 years ago.  I don't play when I'm dating someone.  I've also been a lot more active in the past two years than ever before.  More money these days.  So in terms of age I've been one of the youngest for years now.  But I've got more experience than guys twice my age.  Don't use your credit card, only pay cash.  Don't get any bright ideas to get a cash advance on credit either.  Leave the plastic out of this.  

Some women like older men, some like younger.  I've been around so most will see me.  If you're young you can have one advantage in some cases.  If you're decent looking as well as young, you're going to get treated like a guy she'd do in her real life.  And sometimes that can pay big rewards.