With 57 years on this planet under his belt at that point, Zimmer most certainly was. And he became the latest example of trend in pro football to go older with head-coaching hires.
What about the trend of hiring coaches who are heavy and then become fat?
Holmgren in Seattle, Andy Reid, Stubby...there are others (my favorite was Denny Green, but that goes way back, so not part of 'trend.'. I guess Ryan is a counter example, where he had surgery lost weight and started to suck.