As far as aging goes this how I experienced each decade beginning at 40.
At 40 I felt young and vibrant and at the top of my game in my career. It was a wonderful decade
At 50 I still felt healthy and vibrant and was beginning to feel like an adult

At 60 I felt like this is the best life ever. I was retired and serving as my wife's daycare assistant for our grand children
At 70 I came to the realization that I was old and no longer as vibrant as I used to be with health issues starting to be an issue but my focus became one reflecting upon my life and the contributions I have made and planning to make life good for my kids and grand kids....the Erikson 8th stage of development Wisdom: Integrity vs Despair
So I say enjoy every decade of your life because it's a great ride
At 73 I'm more happy and content than I was at 23