This essay by an Australian novelist in her 70s (via Robin Sloan’s newsletter) is fire and goals, starting with the title: The insults of age: A one-woman assault on condescension.
I’ll let you read how she got fed up enough to get to this point but god I love her for this:
Habits of a lifetime peeled away. The world bristled with opportunities for a woman in her 70s to take a stand. I shouted on planes. I fought for my place in queues. I talked to myself out loud in public. I walked along the street singing a little song under my breath: “Back off. How dare you? Make my day.”
(See also: An Axe for the Frozen Sea for rage in your 40s)