Drinking eight glasses of water a day, taking 10,000 steps daily, and snoozing for eight hours each night have been wellness mantras for years now ― except that they don’t really hold up.

Experts say the amount of water we need depends on our genes and lifestyle; and, in most cases, we should probably just drink when we’re thirsty.

Meanwhile getting in 10,000 steps a day was a marketing ploy from a step tracker company, and most adults should be fine with 7-9 hours of sleep on average (though women may need more).

But just like how many times is normal to get up in the middle of the night (or to pee), the number of hours we should aim to sleep for do change slightly by age.