What a ridiculous assumption. It is not about age! I've seen both young and old horrible coders. Of course you can have a slight advantage from experience if your'e older, but the quality of that experience remains relative to the person in question. You might have 10 years of experience doing things the wrong way!
Growing older doesn't make you a 10x dev, just as it won't make an average musician a superstar.
Growing older doesn't make you a 10x dev, just as it won't make an average musician a superstar.