16 years old
American Airline's F100s were delivered between July 1991 and June 1994, making them between 8 and 11 years old. Not exactly due for replacement
Given that AA have 74 of them, they're a sizeable fleet and look set to be around for some time to come. The fact that they're getting rid of new B717s and keeping the F100s says a lot.
Yes, the 717s were on unfavourable lease terms, but AA could have renegotiated them if they'd wanted to because leasing firms would rather have them flying at lower lease rates than having them sat idle on the ground with no real prospect of finding work for them in the near term.
Hope to see these little fokkers at AA for a long time to come!
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Photo © Jonathan Derden