Earlier quoted context omitted.
People in web development tend to allow dependencies to auto-update. It’s kind of a necessary evil in that the alternative is to do it only manually and then falling behind on security vulnerabilities updates and potentially getting hacked.
But by that argument, if you try to write all of the code doing the functions just by yourself and not bring in any dependencies, and that code is now five years old and you haven't touched it for five years, you might have some security vulnerabilities too. It's not like you are always writing better code than the open source projects are. Unless you are one of the best developers in the world, then sure, then that…
Security vulnerabilities grow in unattended code then?
Or they were there from the second the code was written but with some luck someone noticed them and fixed them?
Old code isn't necessarily insecure just because it's old...