We are already way past the point where we COULD take care of an aging population without population growth. The only reason we can’t do so today is corporate greed.

It will be slower than 5g mmWave, but faster than 4g at the same frequency

The guy you answered to is actually not correct, see my reply to him. 5g can and does use the same frequencies as 4g, the upper frequency limit is just higher but those are only used in dense cities. Rural 5g installations use the same low frequencies as 4g and get better range than 5g at those frequencies

5g exists at different frequencies, just like 4g.

The lowest 4g frequency is 410mhz, and the lowest 5g frequency is 450mhz

The range of a 5g tower can be the same or higher than a 4g tower depending on the frequency used.

I think your confusion seems to come from the existence of 5g mmWave, which is sometimes uses synonymously with 5g. But 5g mmWave towers actually make up only a small fraction of 5g installs, the majority is using the same frequency band as 4g, and when comparing 5g to 4g at the same frequency then 5g actually even has a small range advantage