https://www.techradar.com/news/the-original-retina-macbook-pro-is-now-vintage-according-to-apple

Apple has just designated the original Retina MacBook Pro as ‘vintage’, which means that Apple, and Apple Authorized Service Providers, are no longer obliged to provide service or parts for the laptop. 

If you’re still running an original Retina MacBook Pro and something goes wrong, then you may now find it trickier to fix, as Apple will no longer be providing support.