It matters to me; I have seen two younger T's and one older T who was probably in her 60's.

My first T was in her 30's and super easy to talk to; unfortunately due to circumstance I had to terminate our relationship; but I really did like her a lot; in fact some days I kind of miss her.

The next T was the 60 year old who didn't do one assessment and since I didn't have the sort of trauma she liked; she personally couldn't help me and said I didn't need therapy but instead a good Pdoc.

The next T is 27 and only has a bachelor's degree but is in medical school to become a pdoc. I see him like a brother; he's very easy to talk to and super helpful.

Based on my own personal experiences I prefer younger than 40; since that one T did leave such a bad taste in my mouth.