This is an example of "statistically good advice, but there are exceptions." For a famous list of exceptions, https://www.inc.com/business-insider/founders-who-started-fa...

I would also look up the term "survivorship bias". The above exceptions are famous precisely because there are so few examples of successful teenage founders.

Paul Graham describes what worked for him (with lots of chance involved) as a universal

ig he never said do not build anyway, just treat it as practice