My t is 60, 10 years older than me. When I told her I was freaking out about turning 50, she laughed and say, ah that's still young.
I have always had a therapist who was older than me, for their experience, yet, alas, that will not always be possible.

I figure that after she retires, my next one will be younger, but hopefully still wise.
Possibly related - I struggle with the idea of being in t forever, yet for some of us, the mental illness needs long term maintenance.