who only by moving can balance

Connected to which, experience also doesn't always accrue in the same order, because real life isn't a standardized curriculum. I could have several bits of relevant experience that someone else doesn't, while lacking one or more bits in the same field that they do have. And that's an easy one for people to miss, even if they recognize that chronological age doesn't always correlate with years of experience in an activity, experience, or place.