I agree with Bluto.

When the base was downsized from 1700 pilots to 500 and flying was given to SkyWest the upgrade was at 18-20 years.
In 2010-2012 - probably around 15.
Now, last AE - most junior CA award was hired in Mar, 2008 (737)

On the projected cat list (1 may 2018):
Most junior ER CA - hired in Jan, 1992
320 - Apr, 2007