Same here ! I understand the love of flying, and in just one day of retirement you come from flying a lot to not at all, quit a big choc.
But one moment it is time to stop and let youngsters do there career.
If you are financially secure, love flying and lots of time now, go back to GA, buy or rent an acrobatic plane, fly a cirrus or Malibu if what you want if fly IFR, be an FI and share your experiences ... You can now have the chance to fly for you, and not for the other !
All the best.