IMO, vintage means audio equipment which stood the test of time. So, if we all consider that audio equipment from the 50's and the 60's are vintage stuff, therefore something from the 70's and 80's are imo "almost vintage".
Of course we all could add philosophical vs. technological considerations' time lines concerning this subject...i.e transistors replaced valves, metal vs. plastic etc...or we can change the words "almost vintage" for others....for instance:
"modern vintage".

An interesting quote from a developer from the Swiss company Revox: "We cannot mass produce such masterpieces, they do not age, neither do they lose their value and their technical solution is exemplary even for the generations to come."