If you're old, then the spectrum of possible experience is much broader. You could range from being totally inexperienced to being extremely experienced.
Also, as I get older, I realize that talent plays a significant part (which is independent of age). But there is a huge problem that almost all companies don't know how to identify technical talent; they focus on the wrong attributes like ability to perform under pressure and ability to recall details. Companies should be focusing on a candidate's ability to synthesize information, to rank problems based on their importance and to communicate simply and clearly; that is the real valuable talent.