I'm > 40 and have a very similar story. I mostly work alone now , have never written a unit test in my life and have a few very large mission critical apps wit

I'm > 40 and have a very similar story. I mostly work alone now , have never written a unit test in my life and have a few very large mission critical apps with many millions of dollars of revenue ti d to them. Mobile, native desktop and web. I take my time and thoroughly think through a change and the implications to the systems. I only try to build reusable code if I'm on my 3rd time of trying to use it. Not trying to build a perfect piece of engineering easily cuts my development time in half