Missing date in 'About this mac' window
There are other places in About this Mac, that can give you a hint, like Install date for applications.

Flash storage means SSD. Apple started selling MBP with 1Tb SSD from 2013. You can check your specific model using the serial number at Apple.

I did the check on Apple web site and it say you have a MacBook Pro (Retina, 13-inch, Late 2013)

Here is the full report:



And the full specs are here https://support.apple.com/kb/SP691?locale=en_US