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>GDP has to be at certain levels to support different types of economic activity. E.g. at some point, GDP might be low enough that new semiconductor research isn’t affordable (because all the workers are used up caring for the elderly for example).

The good news is, this won't happen in the US, at least not in the 21st century. So if you're an American, feel lucky.

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Care to elaborate? What makes you so sure that won't happen in the US?

The population growth of the United States will never flatline for any appreciable amount of time. In other words, we'll never run out of workers. This is for two reasons:

(1) We border a rapidly developing nation to the south (Mexico), with significant economic ties at that border.

(2) The United States is, hands down, the most effective society at integrating immigrants and allowing them to be productive. We can always, always import more workers, and people will always, always want to come here.

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