How old is "Too old for" drivers

All depends on the environment the drivers were in. If always in heated/cooled space they could last over 50 years. I have some ProAc's that are over fifty years old and still sound great. Then again, I've had some Boston units that needed re foaming after 10 years. Environment is everything.

I tell ya, some of them drivers I see out there on the road over 90 should NOT be out there, that's too old.

Thanks, I'll be here all week, don't forget to tip your waitress'.

If you notice ivy vine's and weed's growing out of the driver mounting ring's and moth's flying in and out that's not a good sign. Seriously, driver's made since the eightie's will last at least twenty year's or longer due to better sealing, better resistive material's and butyl surround's on the driver's.

Really old speakers may be doing just fine after 50, 60 or even 70 years. Those paper cones can last a very long time if not abused. More recent speakers with foam surrounds are another story. They may rot out after only 15 years or so.