I generally agree, but I have been surprised. We had a bug in a program my company released in the late 90's and that bug only became apparent last year. 5-6

I generally agree, but I have been surprised. We had a bug in a program my company released in the late 90's and that bug only became apparent last year. 5-6 people contacted us for a fix (which we provided). The program was more than 15 years old and it was still in production. That surprised me and made me adjust my views of each of my software releases. They might be deployed in the field for far longer than I had assumed.