I think 7 years is probably at the high end. I work in a small company that started about 8 years ago, and most of the MacBooks (mixture of Pro and Air) we boug

I think 7 years is probably at the high end. I work in a small company that started about 8 years ago, and most of the MacBooks (mixture of Pro and Air) we bought initially failed after 3 to 5 years for a range of issues (even the "second generation" have had failed units).