I think it was OK. I think she was just throwing out a feeler to see if maybe the reason you didn't want to leave the marriage was because you thought you were too old. I was actually more uncertain of her first sentence than the one about being young. She said "you don't want to leave your marriage, do you?" I think something more open-ending would have been good. But I guess she was referring to things you've told her before. Still, it seemed a really closed way to state it, with no space for the client. Also, I wouldn't interpret the "you're young" comment to mean she thought you could find someone else. It could mean a lot of things.

I think a frequent approach in therapy is for the T to make a statement, and then it is up to the client to react to it and tell the T yes that's how it is with me, or no, it''s more like this, T. (My daughter's T has used this a lot with her!) So the T doesn't even have to be "right" in what they said--it's an opening for you to clarify how things truly are with you. So you might have responded to her with something like, "no, it's not that I'm worried about being too old, it's that I really like my H" (or whatever the case may be). Then the T learns more about you.

I hope you and she can discuss it. Not just the part about the marriage but about your concern that she was out of line.