My best friend died suddenly from a heart attack when we were both 42. That precipitated 10 years of panic attacks, with fake heart attack symptoms and a deep fear of dying suddenly on my part, and the feeling that I needed to do something in my life that I had not done yet.
Turns out I was in deep denial about being transgender, and that was what was behind the panic attacks -- which were caused by having to face my own mortality, and the feeling that all of a sudden, time was running out.
Every time I thought about transitioning before that, I kept putting it off until later in life, and filling my life with other things.
Peace, Carly