It's 10 years old. (For a Mac, that's 85 in human years). In 2017, my own 2014 15" MBPro's screen developed a few stuck pixels and a black "bezel" down the L side. I found out that my AppleCare did not cover screen issues (when I bought it in 2014, AppleCare+, which does cover it, did not yet exist--and neither did the annual renewal option). You need to ask yourself whether a $400 screen repair on a 10 year old machine that is about to be "orphaned" by Apple (as my 2012 Time Capsule was) is worth it--especially with a slow several-generations-old CPU, possibly failing RAM, and a mechanical rather than SSD hard drive. Not to mention that even if you are able to currently run Ventura, you likely won't be able to run the next OS.
Yeah, the new 15" MBPros are pricey (but actually a bit cheaper than the 2013 15-incher was when new--and I'm not talking "adjusted for inflation"). For that, you get 16-32GB of RAM, a 1 or 2-TB SSD hard drive, 4 Thunderbolt/USB-C ports, HDMI port, SD card reader, dedicated MagSafe charging, amazing display, newest backlit keyboard, Touch ID, and a screaming fast M2Pro CPU. (You do lose the optical drive, but with those 4 available ports you can plug in a portable external). I just bought a 2023 14" MBPro (16GB RAM, 512GB SSD, M2 chip) now that my 2017 13" Intel version is getting cranky. (I need to back it up before migrating to the new one, which might mean the new one "inherits" some software glitches--but that's a different issue for a different thread).