My parents had a new printer installed by a "professional" but it wouldn't show on the network. I tried everything, reinstalling drivers, unplugging and plugging cables again...
After hours of nothing working, i got desperate and just flipped through the menu of the printer on this small LCD display. There is a DHCP setting. The DHCP is set to a fixed address. The router every now and then reboots and gives new dynamic addresses. The printer refused its dynamic address all this time.
Assuming someone to develop a sufficient consciousness of their time starting with age 10 that would mean anything before 2010.
In all practical matter, people who are 25 now, cannot have any practical recollection of the US invasion of Iraq and are only having broad ideas of the 2007 financial crisis.
That is indeed scary.