If the British civil service, even operating under previous administrations, can put together a multi-functioning government domain that runs reasonably well without JavaScript, there’s no reason Google can’t continue to do the same with a ducking web search.
The former works better with JavaScript, that’s true, but it works OK without and that’s the point.
Then again, the civil service were ordered to do it largely out of spite because the government didn’t want to give the plebs any excuse for not being able to use the site.
I’m not sure how to get Google to lose the need for scripting in the same way.
The brain reaches full maturity around 25. Some parts of the brain stop developing long before then but the pre-frontal cortex is an exceptionally slow developer. It’s responsible for cognitive control: self-regulation both internally and externally.
Basically if you don’t learn behavioural regulation by the age of 25, it’s going to be harder to unlearn those habits afterwards. This is often seen in people who constantly make poor life choices and don’t seem to be able to stop, or people with poor emotional control.