The age on these things.... I honestly have no idea. They are old though. VERY old.
At least 20 years old I would/can guess. They have been through a lot of abuse and use:
This picture is a 2 for 1 deal! You can see the pads are... well, non existant

and the right side (not sure what you call the plastic piece.... holder?) for the right side headphone is now been replaced by a thick guitar pick (as I don't know how to order a new whatever it is to replace the one that broke a long time ago).
However, still listening to everything on them.
Right now, it's Blank/Jones - The Nightfly [Sunbeam Remix]
I think I will get a pair of 7506's soon to retire these.
I just don't like how the 7506's fit AROUND my ear..... maybe I'll get used to it if I get them.
Well, anyways, here is to you MDR-V3's!
