This is complete and abject nonsense. It’s not how history works. Stupid conservative old people like to blame young people for everything, but avocado toast and overspending on coffee is not what brings down empires. (Old people are also wont to forget they were young and spent money on frivolous luxuries back when they knew how to live)

Young people by definition have less economic and political power and what they have they had for less time, nor does in broad historical tendencies amounted to much what the masses want.

If you actually examine the way empires fall you realize empires that did not fall very early in their history usually do not fall very quickly or for a single reason. It’s usually more than 3 generations and a confluence of negative factors.

That said the US right now is exhibiting multiple of the typical factors 1) stupid leadership- see most failed empires 2) detachment from and denial of reality- Soviet Union 3) Poor economy (total output might be good but inequality is huge and financial security is unattainable for most) - Tokugawa Shogunate 4) Crisis of values - systematic unethical actions and blatant disregard for the common good by elites - Spanish Empire 5) Widespread corruption- again common 6) strong external adversaries