I would have a problem going to a therapist that much younger than me. For me a wide age and life experience gap would be a problem. Would a 20-something, single therapist really have realistic insight into raising 3 young men into adulthood, 27 years of marriage, 28 years in a profession, aging parents, impending retirement and aging issues, etc. Sure, they can read it in a book (or google it as you say), but that's a weak substitute for living. I'm not talking about mental health issues; I'm just talking about life.

Some people aren't bothered at all by significant age differences and it works quite well for them, but I do get what you are saying.