Agree with you, I have enjoyed my job and have been lucky in that it allowed me to do different roles and spells of working abroad. I could carry on and earn more money but I am now ready for the next phase of my life, which I see as an adventure. It may be that it does not work out, but won't know until we try it. If it does not there are plenty of other things we may want to do, in no particular order, including unpaid work in developing countries, going on to do further education for the joy of learning (always wanted to do archeology), back packing, camper van etc etc.

You are a long time dead and life can throw you nasty surprises, want to do it while we still can - best wishes