You'll known when it happens, with me it was in 2021 when I fell up the steps into my local butcher and lost whatever dignity I had left. There comes a time when you start having 'falls' and now there's a birthday card to celebrate that fact.
A birthday card with a picture of an elderly woman lying at the foot of a set of stairs. White and light pink text in an angled dark pink box above her reads Happy birthday! You've now reached that age where you 'have a fall'.