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As you say, all definitions are arbitrary. But I'd say that a true classic spans every generation. If you can imagine a name on a son or daughter, and have heard it used on someone of your own age and that of a parent, a grandparent, and ancestors, it's a classic. It doesn't have to have been popular in every generation, just used: it's about consistent use over a long period of time.

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Being from the UK, name usage patterns are different - I've never met anyone called Aaron who wasn't from the US, of any age, so I'd drop that, but ymmv. I'd also drop Arthur for inconsistent use and add Mark, Alexander, Richard and Stephen.
Hannah and Joanna have also had consistent use here for 400+ years.