Some serious experience there!
It's a symptom of an airline that has been in decline and has not hired crewmembers for many years. That is a major part of the problem of merging seniority lists with America West, a younger airline that has been in decline for fewer years.
When things are stagnant in the flying business, experience levels in every seat are high. Not good for progression but it is a luxury to work with people who really know their jobs.
I can remember years ago when the US Air crews looked so young...