My B&W Electrostatic Speakers (DM70 Continental) are from 1970. They have been reconed; Still work really well.
Quad 57's - design from '57 but the panels have been restored recently by WP and are not that old.
B&W 801's s3 were bought in '94 and were a few years old then. Still sound as good as when I brought them in initially. (will outlast me)
Acoustat Model 3 from the 70's - completely refurbished, and modded.
None of the above are my primary speakers.
Quad 57's - design from '57 but the panels have been restored recently by WP and are not that old.
B&W 801's s3 were bought in '94 and were a few years old then. Still sound as good as when I brought them in initially. (will outlast me)
Acoustat Model 3 from the 70's - completely refurbished, and modded.
None of the above are my primary speakers.