My father-in-law retired at 75. He was writing firmware for chip stepper systems. He still reads Science and some chemical engineering stuff. I met a guy on hi

My father-in-law retired at 75. He was writing firmware for chip stepper systems. He still reads Science and some chemical engineering stuff. I met a guy on his 60th birthday who was considering starting another start-up. I'm fifty. I did some back-to-back 100 hour weeks last year, and definitely felt it a lot more than I did when I was 30. But I work smarter and I know more tricks. My .emacs file is full of hardfought wisdom (mostly knowing what to throw out, frankly). I think I have some good years left :-)