It's origin is the HD580, which was released in 1993. That's 30 years ago.
The HD580 Jubilee (1995) and HD600 (1996) are small modifications of the HD580, and the HD650 (2003) has slightly less distortion.

It's old - ancient, if you were to apply the same metrics as for e.g. semiconductors.
But (passive) headphones are not semiconductors, and how good a headphone is generally doesn't correlate a lot with how old it is.