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katiekat I think I do understand what you mean.
My point would be that to find a motherly sense of comfort, I would look first at their therapeutic approach and their personal approach, how they respond if you talk to them about wanting that motherly-type comfort, and how you feel about them when you talk on the phone or have an initial meeting.
My history actually makes me strongly resist any idea of motherly support, and despite that I've had all sorts of transference and feelings of my therapist being the mother I would have wanted - even though she was younger than me. What I was responding to was her caring and compassion. One reason I chose her was because of her type of therapy, which includes being very compassion-based - not all therapies are. Not all therapists are, whatever their age.
Do you know what therapeutic approach(es) are available and what you might prefer? Do you know what you're looking for in a therapist in terms of their training, experience, approach, their way of communicating, whether they allow contact outside sessions, their beliefs about trauma and recovery? Do you have an idea of the things that would be a big plus for you in a therapist and the things that would be a big minus? What I'm trying to get at is that I think considering those things and basing your search around them is the most important thing.
In terms of a therapy relationship, I think gender is a little different. I could explain more but I think it would be a bit off topic.
If you have a lot of trauma therapists to choose from, if you can shortlist on your preferred age range and still find the type of therapist with the type of approach you want, then it isn't an issue. I don't have a sense from what you write of any other things that you're basing your search on. Perhaps, though, you've thought a lot of other things through and I'm just not aware of that.