How turning 40 changed my life and my 3 Aha moments (not the band!)

At 40 we are, in theory, half way through.
The first 40 years are about fun, growth, new beginning and new experiences. The more I thought about it, the more I convinced myself that my next 40 years would be about change as my kids grew up and moved on, sadness as loved ones grew older, despair at my fading youth and mobility and fear of the mortality of me and those around me.
I convinced myself my future would be shit. This was total bullshit. I was catastrophising. Looking at the worst case scenario instead of the possibilities, opportunities and happiness that would and could exist.
Long story short, I started working on myself and my mindset and this is when the magic happened for me.