Arguably, her limited life experience has not equipped her with the same skills that a seasoned pol/business owner/manager might have. She hasn't worked much with others. She hasn't built coalitions. She hasn't done much retail politicking (earning popular consent).
So yeah, maybe "age" isn't the perfect metric, but I do think it tells us something about life experiences and skillsets.
To your point, though, it's imperfect - probably better to discuss those things in detail.
If you're a consultant and your answer is "I don't think so" then doesn't that have to be part of your campaign?