Re: Macs typically have a longer usable life than Windows PCs ...
Windows 7 is still in support, having been released in 2009, regardless of what hardware it's running on.
You're slightly correct in saying that OS X Lion isn't in support, having been released in 2011. There have been several *free* upgrades of OS X in the meantime that allow Mac users to stay current.
I'm still not getting your point... You're comparing apples and oranges (no pun intended).