I was pretty sad about turning 20 and 30 🙃 my now DH took me to Paris for my 30th and we spent the day going to museums, eating good food and drinking wine. It was fantastic and I was pretty happy in my 30s and grew up a lot.
I did all the grown up things in my 30s, we got married, had our children, bought our forever home, I went to uni to get my degree and started on my career path. People (family) showed their true colours during that decade and I went NC, so there was some real sadness.
I was pretty OK about turning 40, although not quite qualified in my field at that point and the house still needed a lot of work. My DH arranged childcare and took me for a lovely meal.
Now fast heading to 50 and my 40s have been pretty good to me so far, this is the decade where I am trying to improve myself, learning a new language and to make some serious money to pay off our debt and our house. I will finish my book I am writing. Also trying to take care of my health and my body, so I go into my 50s in good health. Health is wealth.
My eldest only sibling died at 45, so I am philosophical about aging, and try to feel grateful for everyday. Getting older is a privilege denied to many.
The whole point of my post is these big birthdays are where we sometimes take stock of where we are and where we want to get to, and who we want to be. So I try to see it as a gift. Happy birthday OP when it comes, hope this is your best decade so far, you haven't yet lived some of your best days 💐