I have seen things
I liked that. I am am 68 and although I 'retired' last year (from managing a deep learning team at Capital One), I stay active. Currently I am writing a combined iOS and macOS app (so I needed to spin up on Swift and SwiftUI, and how to use built in support for building deep learning models, instead TensorFlow which is what I am used to). I recently published a book on the very cool Hy Lisp programming language (you can read it free at https://leanpub.com/hy-lisp-python).I get inspiration from my father. He is 98 and has taught himself 3D animation and video editing, and keeps himself very busy creating videos for the international right to die organization. (He was a physicist and is still a member of the National Academy of Sciences.)So, for all you young 50 year olds, I say to you: it is not over until it is over :-)