What odd decisions or big changes have you made?
I think I've had 2. At 40 I very nearly had an affair. I did the right thing and walked away eventually, but it brought about quite a lot of change in my life as I realised what actually made me tick, rather than what I'd always accepted/been told I wanted from life.
In my early 50s I've suddenly become adventurous and impulsive, in my clothes, my work, travel, doing loads of things I wouldn't have dreamt I was capable of.