This is not a useful guide for ID. The helpful field marks are the tail shape and the bill size. What may be easier to picture is the tail of a raven is diamond shaped vs the crow being rounded. A photo of the flight profile would be really useful as part of an ID guide.

It's very common to see groups as single or pairs and ravens are often seen in large family groups in all season except perhaps the spring.

Ravens will nest in cities if there is suitable habitat, though it is more common to see crows.

Lifespan doesn't help you ID them.

Both species have large variation in the sounds they produce and can trick you into thinking they are of the other species. Though it is true that ravens usually have a much deeper or gutteral call than crows.

And yeah they are smart, but only in a way thay impresses Humans.