I guess I am very lucky then. I am 60 and still very active in development. I develop my own products and I develop new products for clients in various industries. The range is very wide (firmware, low level soft, enterprise applications back and front end, equipment / process control, desktop productivity and entertainment software etc. etc).

I do get tired every once in a while but since I am an independent company I can almost always take my time and recover. So far I did not loose any of that sense of excitement when starting on design of completely new project. I guess being ISV for the last 22 years helps greatly in this department.

Also read a lot, play me some music on keyboard (insanely bad but who cares) and do fair bit of physical activity (cycling, hiking, swimming in the lakes and ocean.

As a result I am very fit, have lots of energy and my brain is always itching to start something new.

What I do not have is a ton of money but I am not doing too bad and would not trade my freedom for anything