eBay's vintage drum section says it's "pre-1980", but there's no rules about any of this - it's a work in progress.
People will be different depending on when they were born. I was born in '56 so no way a 1970 drumset seems vintage to me. A late 60's set is, to me, barely vintage. When I grew up and started getting into drums, all the drummers in the small world I knew used Ludwigs, Rogers and Gretsch. All the Pearl drums we saw back then were horrible, and we used to use "Pearl" as the example of the worst quality made, like Peavey is used today.
But like Peavey, Pearl did get their act together, and have made (hard for me to admit because I haven't fully gotten over their 1st impression) great drums.
That set you're looking at looks like a good deal. Ask the guy what he'll take for them and it might even be a better deal. Most people state a higher price than they expect to get. They look fine... an 18" floor tom is not the norm but who cares. Pearl hardware is well designed and I like the larger kick.
Really, with drums you can change heads and tweak and get almost any drum to sound good.
Cymbals... you can't do much so they are harder to find.