There is a provider who advertises rates for men over 60 that is $200 more than for those under that age. Can anyone explain the rationale?

My guess is that she thinks it's harder for older men to cum so it's more work for her.  

Maybe because they last longer

And can fuck forever without the blue pill?  Lady may be afraid of an over use injury?

Re: Maybe because they last longer

Exactly! I’m glad she disclosed that, now I know to never become her client.
I just read a glowing report of an 80 year old client by Lady Whistledown, who knows what’s what.

Is there a link?

I guess to each their own .

So the idea of older men results in you pulling a moue.
Do you add a surcharge for age? Do you upcharge by the year?
Conversely, do you charge less for a young, hot guy?
There are all kinds of discrimination, mon petit.  
Guys of a certain age have their assets, and can run rings around some younger bros. You are free to overcharge because of personal preference, non? And older gentlemen are free to vote with their wallet.  It does display a certain lack of character, though.