My father in law is such a "thinker". He has been since the 70s and worked on all kinds of projects from IBM Mainframes for up to Hadoop and Kafka for Insurance Companies and Telkos.

It's ridiculous to me how hard it is for him to find a new job at 60. He financially doesn't have to, but he wants to train younger guys on how to deal with all the weirdness one encounters in ETL Jobs.