I retired (PVR'd) at 58 years old and did not a lot for 6 months. Then the boredom arrived. I decided to go back to part-time paid work:
1. As a Registration Officer Ceremonies (ROC) for local Council. This involves marrying people, Civil Ceremonies etc. £10 per hour + 45p/mile. Great job and you can work as little as you want. It is mainly weekends though. You see all walks of life and the need for attention to detail and time awareness (just like RAF), as you may be doing 3 weddings 2 hours apart.
2. Seasonal but again great fun--invigilating exams at a local Independent school £10 again. Keeps you young and in touch with young adults-even though they see me as a fossil!
3. Playing on the AIM -- but beware it is Cowboy Country--do your own research and don't gamble the farm!
Good Luck all-just a few ideas of what I do--hope it helps someone.
PM if you need more info.