My normal encounter is with mid thirties or so providers. Once in a while late twenties, and very rarely 21-25.  The age difference and experience level are the main reasons.   I had a really poor experience once, and a great but kinda odd experience the other time.  (she turned a two hour meeting into over 8 hours, and I happily participated).  That was quite a while ago, and this week I am giving it another try.  The old reasons for staying away are still gnawing at me, but my back channeling has come out really positive.  Still not sure if I am making the right decision, but there is no turning back now.

I've had good and bad experiences with the young ones.  Worst experience was right as she was putting the condom on, she said "I don't like old guys"....then the best was one I saw over and over...a sweet ride if there ever was one, not an ounce of fat anywhere on her (and believe me I checked every inch multiple times)...I had a nickname for her....my little Ferrari!  
Just like anytime you see anyone new in this business..it's a crap shoot that your personalities mesh.

For every 1 good experience in this age range I have had three bad ones.

But I have found that I am more drawn to those over 30, than the real young ones.  I will say that none of my young encounters was unsatisfactory, they were all good.

...video.  I had never heard of it - it's a porn website where older men fuck young women.  Funny name though, and a nice compliment.

...however, I have had a few dalliances with girls in the range you mentioned and all were very satisfying.  The key is their maturity not their age, which you can gauge by reading their reviews and website.  

I Like All Ages (Legal Age That Is) !!!!Just depends on the mood !!!

Not a recent event and she had no clue what she was doing.  I find my sweet spot is mid 40s.  For me, maturity and experience trump youth and exuberance. Having said that, though, I've also had good times with ages beginning with 3 and 5.  Oh hell, maybe I'm just easy.  LOL!

I started out seeing ladies from one agency. About half of the ladies I saw there were 21 to 25. I do enjoy the older ladies and mostly see them now but I'd see the young ones if they caught my attention. It is a different experience but as a previous poster said it's their maturity not their age.  

I only see independents-I haven't used an agency in 20 years.....

...there is nothing better than a young tight pussy.

Most of my experiences with this young age have been not so good.   They seem to think that I can perform like a 30 year old stud.   I'm 74 and just can't do that anymore as bad as I would like to. I prefer the mid 40 range. They know what they are doing as well as know what I can't do. Thank you to all the ladies that put up with me. They tell me I'm a good client, I think it's that they don't have to work as hard with me. Most often just a BJ for me and no mess as I don't ejaculate anymore. Plus I'm always freshly showered and never haggle the price with them.

is dependent on the information I can gather.  If her reviews are exceptional and the back-channel advice matches the reviews, then it is a matter of getting calendars aligned and going for it.  Usually I will see this age range for a 1-hr. encounter rather than a longer engagement.

...and it had been about a year since the time before that. I'll go wherever someone I'm intested in is.

I guess there's only one simple way to say this........Never!!  
26-30? Never! 31-35? Occasionally. 36-40? Absolutely. 41+ Ahhhhhhhh!!

I wish they had a  60 plus category on the age bracket.
50 and up js my preference

....just make sure the 3 and 5 are followed by another digit.  I could not help myself...........

I had one really good experience with an amp. She said she was 25, but who knows? She was a tiny little thing with a great attitude and a contortionist body. I was on my hands and knees, she placed her feet on my belly just above my hips, and then she arched herself up and achieved a perfect thrust angle for penetration. I got off quickly, a hell of an achievement for a guy my age, and when she felt me pulsing semen she put the vagina squeeze on me and started giggling. It doesn’t get much better than that. I wanted to see her again, but when I went back she wasn’t there. She had moved on

Touché!!  Thanks for the humor!

...yesterday I visited a lovely 26yo in LA.  Stunning body, crazy sex skills, horny as hell.  But I loved when she told me she just did not like fucking guys her age.  She prefers older men.  Her first was a sugar daddy she had at age 19 and she's never looked back.  This girl knows what she likes, and knows what we older guys like and what we can do for her.  As she said, win/win.

...She is new to the business but was very comfortable with things. Good Times!!

... And from a pure sexual transaction point of view, she was outstanding. Amazing body and serious skills.  But I am not really tempted to repeat, since I feel like lots of variety with this category of provider.  She (and so far others of similar age) does everything right, but there is no mistaking that what is being delivered is an oft-repeated transaction.  I expect that it would not be a lot different if there was a repeat visit.  Not that there's anything wrong with that .    

....A LOT do. Most (when I say most I mean at least 3/4) of the men I meet are 50+. One of my "ATF" lovers actually is pushing mid-60's and we don't dwell much on the age difference.

Most of the women I see are in this age range – maybe a year or two older. I like them and they seem to like me.  

yeah, I tend to see late 20s to mid 30s, although I've just gotten started in the hobby. The one 20 yr old was so young that it kind of set me back (grand daughter age). Felt not right on that one.