Those are really old. I have one that is 40 years old and is perhaps 40 feet tall.

There several of these and other old trees around campus including a huge Ginkgo.

They look an unusual shape for a blue spruce, with the lack of a pointy top and wider base plus the curved up branches. Is this typical for older specimens?

I think it has to do both with age and because these plants are probably not clones or cultivars, just random seedings.

I found this picture of some old trees showing a similar habit.

https://www.google.com/search?...

Very interesting. I've never (knowingly at least) seen a specimen old enough to look like that.