There is so much that is good in this article. Just perfect really.
When a programmer gets to a certain age, she knows a lot of stuff. But there’s a ton of stuff she doesn’t know, as well, because no one can know even a fraction of everything that’s going on in this industry. It’s far better, unless you’re applying for a junior position, to start at 70 and get credit for everything you do know, than to start at 90 (or even 100) and get debited for the things you don’t know.