I didn't want to spend the time determining the average age of current NFL HC's, but some guy did it in 2011, and the average then was 50.41............... Philbin is 52. If your supposed to be retiring at 52, then I really need to get to work.
I'm not a fan of Philbin, but I don't think he's struggling because of age.
My point was not his age per se, but his age when getting his first chance, most 52 hear old HCs have been HCs for 15 years
or so, it's rare to have a HC starting out at 50.
I don't think the average age for first time HC's in their first year is 35 (Philbin was 50 when he started). Listen, getting a HC gig is pretty tough, there's generally 6 or less openings a year.
By the way, there's a lot of current HC's that didn't get their first NFL HC start till they were around 50 or older...............Chip Kelly (49), Tom Coughlin (48), Mike Zimmer (57), Gus Bradley (47), Chuck Pagano (51), Bruce Arains (60), Mike Smith (48), Doug Marrone (47), Marc Trestman (56), Mike Pettine (47), Ron Rivera (49) and Jim Caldwell (54).
Well, I didn't say it doesn't happen, but on your list there are only 3 guys who were 50 or older, Zimmer, Pagano and Trestman, and I'm taking into account that Philbin has never been a HC at any level, your list is only their first NFL HC spot, not their first HC job, Kelly was 45, Coughlin was 24, Ariens was 29, Marrone was 45, Pettine was 29 and Caldwell was 38.
There is also not a lot of proven talent in the list you give, many of them are in a similar boat to Philbin.