I've had the same pair of HD25's for almost 13 years now. I've changed the ear pads a few times obviously, it's nice to try the velour every now and then. Think I've only ever changed the cable once in that time. They are built to last! They are getting on a bit in the cans themselves now, they aren't as clear as they used to be and the low frequency has dropped off a bit (could also be my hearing from blasting my ears with these week in and week out for 13 years) so it's probably time to replace them but definitely not a requirement. I was thinking about trying out the TMA1's for my next set but it's hard to go past the HD25's!