I have been a few times when Indy`s I wanted to see were busy. Each time I have seen Haylee aka Chrissy from BBC and recommend her. To each their own though, she is on the north side of 30 now and if you are after a 20 or 21 year old, they may have someone to suit your needs. All I can say with Haylee, you will get your $$.4 worth. https://perb.cc/vbulletin/showthread.php?151722-Haylee-Spa540-aka-Chrissy-BBC&p=1167398&viewfull=1#post1167398
NOT all are over 30 but a few are and I view their site a few times a month to check out their new talent. They have had a number of < 25 yr old women there numerous times.
You could also consider a few Indy's here on Perb. Blonde Brynn is 25, Scarlett Sweet is 21 and Sasha Carmelle is 24. Sure you may pay a bit more but I am betting your experience would be very much more than visiting any Spa. I have not seen any of these three SP's but if you do some research you will see their reviews are all excellent. I tend to see the SP's who are > 28 or so