I know I should replace this MacBook Air but there's a guy in town trying to make a go of being a Mac reseller and repair depot (among other things).
I think I'll take it up there and have him replace the battery and the few keycaps that have rubbed off.
It's a mid-2011 Core i5 1.7 Ghz with 4GB of RAM and 256GB of SSD storage. A bit long in the tooth but it still gets the job done.