I often hear that reading widely can add in interest to life. There is nothing wrong with reading mysteries or love stories as long as they are fun and reasonably satisfying. But as I age, I get more and more impressed with writing. This is still a good time to buy pads of paper or spiral notebooks. I find that 6 or so notebooks are handy to keep in convenient places. I like ball point pens ready to go, too.
My concentration wavers more and I often lose track of what I am doing. A note helps enormously and reminds me.
I like to just list notes of importance one after the other.