I just used Experian and one of Experian's partner service to get some data on my file. Both came up with an average age of 3.9 years (wanted to make sure offshoots of Experian showed the same data. They did. I then went and counted all my cards on record and wrote down the account opening dates. The total came to 709 months amongst 15 open/closed accounts. Divided by 12 months = 3.93 years. So it seems that the closed accounts (and I only have 2 heavily weighted from the 90's) averaged into a mix of mostly accounts opened in the last 24 months.
I'm thinking since I got an Amex since 29 months ago, maybe applying for another Amex just to get my age grandfathered into the new Amex account. This would change my Experian age minimally ( to about 3.8 years). But I would benefit on my Equifax and TU reports where my average ages are about 2 years, if my new Amex actually does get the age grandfathered in.
What do all of you think? I can certainly take the inquiry.