I don't think it really matters when it comes to evoking transference of various kinds, no. The therapist's age matters to me in general, but when it comes to transference it's much more of a free-for-all than that. I've had some complicated parental transference with a therapist who was 10 years older than me, and possibly even to a therapist about the same age as me, though the latter case was messy enough that it's hard to tell what really happened there. I've also had times when no parental transference developed in relation to therapists who actually were old enough to be my parents.