I’m a 73 year old, inventor/entrepreneur. I haven't worked for someone else since I was 19.
The first product that I ever developed was chosen as one of the 100 most important products developed in the world the year that I developed it. (This was in the late 1960’s)
Since then, I've developed things like impact recorders employed to monitor the transport of sensitive products (from art objects to power transformers), temperature recorders to monitor the shipment of perishables, and a derailment detector that’s employed to stop derailments before they become catastrophic. They’re used on many commuter systems around America, such as B.A.R.T. in San Francisco and the Metro in Washington D.C..
In 1985-6 I developed a disposable, “no-touch” poop scooper and then several lines of natural, nutritional treats for dogs and cats.