That's a bit of an understatement. Basically all Squeak and VisualWorks images have been running since some time in the late '70s. They've been migrated from 16- to 32- to 64-bits and across chip architectures, but it's the same image. Other dialects were bootstrapped more recently, and some of them have retained the ability to create an image from scratch.

I guess bootstrapping is more common in the Lisp world.