Everything is correct except for the first one. Hydration is HEAVILY dependent on age. Younger bodies can hold on to way more water, and that decreases as we age. This is the primary reason why we get worse hangovers as we age.

Drink water while it makes you feel good, but for the love of God, do not force-hydrate yourself, especially if you are not 40.

https://www.thecut.com/2016/06/why-your-hangovers-just-keep-...