When do Rolex’s attain vintage status?

[rushca01]

Using the sea dweller as an example when do the legacy 16600 attain vintage status? Is it commonly accepted that all sea dwellers prior to the gold surrounds are now vintage (which I believe are the 16660 reference) but if they have gold surrounds (16600/tritium) they aren’t quite vintage yet? Would the next step be the 16600 tritium sea dwellers with gold surrounds the next to become vintage? What is the natural progression of this? I used the sea dweller as a reference as I’m most familiar with its variations over the last 30 years.