That you will become filthy rich as a software developer. You can make a good living, probably upper middle class, but getting rich is doing software isn't common and is rarely a long term situation. For example, I made a huge amount of money for a few years during the late 1990's dot-com boom. I've never come close to making that kind of money since.
That once you get to 30, you can't program any more because people past that age are unwilling/unable to learn new things. A common bit of ageism that's popular in some circles.
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