Pack your toiletry bag the night prior to traveling and only use that travel bag when getting ready the morning that begins your travels. This way, you will identify anything you may not have packed the night before and will have time to add it to your toiletry bag before setting off.
Very true for "basic" life lessons, things that don't change very much over time. It's not a generation thing, just a matter of people having lived long enough to gain a lot of experience in various topics.
BUT an absolute disaster, when it comes to things that change over time. The faster and more fundamental things change, the worse would be any advice from people getting their experience before the changed.
So, basically: Learn to differ what topics you can get really helpful advice from older people, and what things you'd better not ask them.
or but washing machine in bathroom....