(and this is what I've heard)

-they're more likely to be aggressive
-they're more likely to mess up the appointment (financially)
-they're more likely to be rude/disrespectful
 etc.

Thankfully, I've had young clients (the youngest being 23 while I'm 21!) and they've all been very kind and respectful. Ultimately it just depends on the person.

Good luck!

AGE has little do with...

In my experience as a companion, I have found, that age has little to do with maturity or couth or even skill as a lover.  
My youngest client: 18/yr old female  
My oldest client: 87/yr old professor  
 
I have met gentlemen who are well beyond the age of should having learned some social graces; but  they were the most obnoxious, crass, overly tacky, too excitable, awkwardly rough with my body and gawky men.
 
and I have also met the young buck fellas, who have had such an old soul around them, and an genuine interest in being a good lover and making sure that I have an enjoyable time, and were youthful and fun to be around.

In the end, it comes down to the person. Person by person basis.  
If a client can pass my screening, and has spoken to me with respect and has a knowledge of how the hobby goes, then I am only too happy to see them

I have had some really beautiful times with younger men. The ones I've seen were kind and lovely, and made me feel at ease. I never had to resort to being an ageist.  
The good thing about NYC, is that when one refuses you, there is always another lady out there who will say yes to you.

Of course there are exceptions but I generally can't feel comfortable with someone under a certain age. 27 is my minimum normally unless he's had some military background (then as young as 21 sometimes).

I have to say that a lot of clients ask me if it's ok to see them coz they're in their 20s or 30s...I don't mind the age as long as the client is respectful...I have to say though that a lot of younger guys have no manners and that is why a lot of providers refuse to see younger guys...It's really sad for the Young nice ones...coz there are a lot of nice Young guys out there!!
I have noticed that when a guy mentions..."do you like younger guys?" he's telling me right away that he's immature and wants a special treatment!! I'm speaking from my own personal experience! Honestly i don't care about age...as long as they're at least 18...
I have had as Young as 19 and as old as 70...and im 51!! if you treat me with respect and act like a gentlemen, your age is not an issue for me!
BJ xxx

While I do hear alot that other providers do not wish to see younger gents...It is turn on to me!!!

Each lady has their own preference by age and race...that is their choice and I respect that. Best for you to do is to make sure and read the ladies website thoroughly....in most cases if they have a preference, you will find it on there.  

Now me personally...I am very drawn to younger men and I love it when I can fulfill a fantasy of a MILF or a cougar...Most younger gents love the older ladies for experience and just no games.

Good luck on your search....and if you want to see me I happen to be in NYC tomorrow till Friday...Now I do screen.

Let me know and good luck on your search...