Since my retirement in 2001, I have managed to remain moderately alert by spending time in my Department office and talking to colleagues.
Among the attractions of retirement is that one can enjoy seminars and colloquia without being obliged to attend faculty meetings.When Mike Karabatsos is not in Greece he usually spends time here as well, and we exchange opinions on the state of American politics and other subjects.
I also spend time revising and enlarging my Virtual Text website and its interactive problem collection.
Emails from users indicate it remains a popular resource. The following link provides an example of the interactive nature of many problems.