The accident of birth meant that you were born in a first world country. You likely had the opportunity to attend college. You were able to live in or easily move to a large town with a solid company who needed your skills. You were born with enough intelligence to obtain and retain your job as a prototype engineer, which many folks are not capable of being. Your health held out for the majority of your work life, allowing you to work that long. You happened to be born in a country with a 401(k) option, that didn't go through a several decades-long recession (like Japan) or hyperinflation (like Mexico).
Lots of luck going on here, IMHO. That said, your accomplishments aren't to be overlooked. I'd suggest reading the book "Guns, Germs, and Steel", if you think you are completely responsible for your position in life.
In my case, I was lucky enough to be born in America, to college-educated parents. I was lucky to be given education, including college. I was lucky to be born with above-average intelligence. I worked hard in college, and harder and more efficiently at my jobs. I was lucky to get my first job in the summer of '91, when almost no one was hiring (part luck, part degree, part work experience on the resume). I was lucky to have a friend who had a friend to was a partner at a company in Hawaii. I was lucky that when I interviewed with the the second time, they hired me (ok, part luck, part skill and past experience). I was lucky to work for an ESOP company for 17 years, even though I didn't know what one was when I started. I (we) have been fortunate with the US stock market's overall returns over the past couple of decades (not exactly luck, but really, we don't have much control over the market's performance). Our choice to invest is not luck.