I bought it last June. 3-4 months, actually. What I meant was that from the indications of the new MacBooks, they won't be such a huge update that waiting for the new ones would have been a waste of time. Don't need or like the new keyboards. Don't need or like losing MagSafe or all the ports.
Mac laptops are generally solid performers for 5-years. As-in you shouldn't feel bad for using a device that is 5 years old. After that of course, it has tended to fall off because you start not getting new features released in macOS. I'm using a mid-2012 MacBook Pro and the biggest issue has been drive space, although Sierra did a lot to address that and now I can't unlock my laptop with my Apple Watch.
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There's nothing wrong with a standard mouse. Trackpads aren't for everyone.
Except that using the mouse means you're missing out on a substantial number of improvements made to the OS and apps generally. You must assume the OS is being designed around the trackpad, not the mouse experience.