What beauty/skincare advice has stood the test of time? Which products/methods do you swear by?

I was watching old grooming and skincare videos recently on Youtube from the 40's, 50's, and 60's pertaining to makeup, grooming, and skincare. Many of us have learned skincare and beauty secrets from our mothers, aunts, grandmothers, and other female relatives or older women about how to care for ourselves. Which products or methods do you all still use to this day?