Birthdays do cause some reflection, and I can see an arc of stuff (a shitload of an arc!) but find that in general things are doing well. At this point I wear the same size clothes I did when I was a senior in high school and some of my clothes are that old that I still wear (mostly outdoors stuff leftover from climbing and backpacking). In between there were a whole bunch of moves, jobs, two children, a bunch of pets, gardens, new skills learned, old skills revisited, and I'm back to my old habit of reading a lot more books (now that I'm turning off the computer way before bedtime.) Looking forward to the next 70 years.
In my mid-20s I was thinner during a very vigorous few years in park and forestry work and some of those clothes are still a bit snug, but I held onto a few of the favorites. One of these days I'll try them on and be surprised they fit or remake garments or finally give them away. Perhaps the birthday week is the time to take those down and evaluate.
This evening I'll be setting up more glassware on eBay. Smaller project, easier to list and pack than cast iron machines.