due to your references or lack thereof.  

Don't be shy.  It's ok to tell the girl that your new, have never done this, etc.  These girls have seen it all, and most of them know how to put those nerves at ease pretty quickly.

When you get to the appointment if you are nervous, just tell her that you are kind of nervous since it's your first time.

Most important thing to remember is:  HAVE FUN!!!!

nervous

first timers are always nervous..just relax and enjoy..the jitters soon turn to joy..you will soon be addicted..at 64 you should relish every opportunity..no matter how much snow is on the roof..you have to keep stoking that furnace..

I had heart palpitations, nervous as a bridegroom, yet managed to get through the call and make the appointment.  The first few minutes of that first appointment were also a little unnerving, but I chose wisely, and she allowed me a few minutes to relax, thus resulting in a great time for us both.  

That was over eight years ago, and I still see that wonderful lady to this day.  That aside, up to you to decide whether you wish to mention this when calling.  She'll learn this when you meet her in person, and if you meet with a quality lady, she'll be cool with it.  

One piece of advice at your age...you will do better with ladies 35 or older the first few times that you play.   This is not to say that the younger ladies aren't worth seeing, but you might wish to establish yourself and develop a comfort level with yourself as a hobbyist before you branch out into areas beyond your comfort zone as it exists now.

Best of luck!