what have you learned?

Some years ago a friend suggested that I make a list (I love lists!) of everything - well, not everything, but a few things - that I have learned since I turned 60.  It's a game you can play with yourself at odd times and it also provides some ah-hah moments about some things you never knew you knew, or didn't.  I learned the displacement theory of measurement when I was 21, watching my cousin measure the butter for a cake. (People baked cakes from scratch in those days.)  I remember learning how to fill a drum-type humidifier (old model), by watching someone pour the water directly onto the drum instead of down the side and wetting everything.  But I didn't learn how to fill an ice cube tray until I was post-sixty and watched my daughter tip the tray under the flow of water, letting gravity fill the lower compartments. As  far as the metric system is concerned, I am an alien on this planet. I know that 20 is light cardigan weather, and a few palindromes:  82 F is 28 C; 61 F is 16 C, like that.  Dealing with kilometres, I simply estimate driving time; a place is not x-number of kliks away, it's 20 minutes' drive, or whatever.  Canadian butchers cater to AM (ante-metric) older people by pricing meat at  so much per pound and I, for one, am grateful. As for cheese I measure my needs with my hands, arranging my fingers into wedge shapes or widths. These are all methods I have developed since I turned 60.  Those of you in my range probably have a new trick or two up your sleeve.   Is it too much to hope to learn some from you?