Here I go, the laptops I have had so far:

Lenovo Thinkpad Y460- died In a year.
Acer C720 Chromebook- Sold in a year
Asus Eeepad 1015 (or something)- sold In a year
Macbook Air 11" (2014)- RMAed within a year
Asus Chromebook (given to friend)
Lenovo Chromebook- RMAedjust now
2015 Macbook Air (sold)
Dell Chromebook- best one yet.

and my oldest machine, and the one I am typing on right now- NL1 Classmate PC (2008 vintage). Runs chrome os like a charm and just put an extension to run it faster.

A friend gave me a Windows 2000 Toshiba- still works bar the battery. I should actually start it up and play train simulator :P

I've gone through many machines in 4 years- mostly because I sold them. only had one die on me. so in my limited experience, I agree- 5 years is a great run for a Vaio, but doesnt beat me with 8 on this old educational netbook

If it is running slow- a clean wipe and install of Windows or Linux should take care of that. a SSD upgrade is worth it too. If that isnt worth it to you- laptops have dropped in price and are much better than they were.