On February 2013, I bought a 15″ MacBook Pro Retina Display Notebook. It came with a 512GB solid state drive, 16 GB of RAM, 2.7 GHz i7 processor running Mac OS 10.8.
Over the years I have upgraded the OS to Mavericks and now Yosemite. It will be 2 years since I bought the laptop in 4 months. And it still feels new!