Ben wonders if Dr. Katz should think about retiring, as he seems to be slowin...
Dr. Katz, Professional Therapist
Season 5 Episode 15: Anniversary
Dr. Katz tells Ben that his 25th wedding anniversary is coming up. Ben realizes that he's 25 himself, and concludes he must've been born out of wedlock. Dr. Katz reassures him that he meant it was his 26th anniversary.