I'm currently interviewing at a big company. The position is in a unit that is just being created. It's just now that I've met the person who would be my boss. He is 4 years younger than I (I'm in my early thirties) and has just 1 more year of experience in my field than I. Admittedly, it's with a company better than mine, but not dramatically so. I'm much better educated though - formal education matters in my field and takes time.
Our leadership experience is also very similar: we have managed project teams but not people as their supervisors.
I'm wondering whether having an experienced manager should be a red flag for a candidate. First, because he's incredibly young for this position compared to other companies. I couldn't believe it when I googled him. Secondly, because we are almost equals in terms of experience and, probably, skills.