Shortly before I left the RAF at 55, as part of the resettlement service I sat down with a financial adviser to discuss, my pension forecast and my other bits and pieces to work out if I needed to work for a living or could actually retire. As I recall, it was a free assessment and gave me excellent advice. Having gone through my plans, my ins and outs the advice was I would be mad to work unless I really wanted to, and it was spot on.
I never had another job and I never worked so hard as I did after I retired, but doing the things I wanted to do. The trick is not to have expensive hobbies or to make your hobbies work for you.