Currently Being ModeratedMar 19, 2013 3:09 PM (in response to Day28)
Genuine Apple power adapters will last as long as your Mac, if you take care of them:
Currently Being ModeratedNov 13, 2013 8:34 PM (in response to Day28)
The charger sitting on my desk, in use with my current MBP was the original one which shipped with my previous MBP. I purchased that machine in Late 2007, and the 85W charger is still working fine and sits here on my desk for use with my current system (a Late 2011 MBP). I have the charger that came with the Late 2011 MBP when I bought it 2 years ago in my backpack and it gets carried around and used almost every day, and it also is still working with no issues.
I did purchase a 3rd party "clone" power adapter for my older system, and it still works, although the flip-out prongs" connector has gone bad, and I had to use it with an external cabel to plug it in. That charger is still with my old MBP with a new owner and they are using both fine with no issues that I know of, other than the vendor sold it as an 85W adapter, but it was really only a 45W adapter...