> I have a laptop from mid-2009 that's still good ... was my portable machine until late 2013. I don't think this should count as a counterexample. You have sw

> I have a laptop from mid-2009 that's still good ... was my portable machine until late 2013. I don't think this should count as a counterexample. You have switched laptops in 2013, and while there could be many valid reasons for that (battery life, more power for development, your old laptop does not support a new OS) it made you old laptop inadequate -- and hence the switch.