the slowly growing realization that your body is wearing out.

Along with this awareness that I'm "starting to feel my age" comes the reality that I am also never going to be able to retire.

Well, you get to my age at 65 and realize that you're still expected to keep going at a speed that would be challenging to a 25-year-old... and if you don't, you can look forward to living under a tarp, under an overpass, eating cat food for the rest of your life!

Uhm, well my dear friend, then I'm just guessing now that if you use to watch YouTube videos frequently, you probably haven't come across enough Tai Chi ads yet. LoL