<p>The proposition by the OP is something that we have also thought about. After retirement, which isn't all that far in the future, we would consider going abroad to study/experience a different language and culture (e.g., to Germany and enroll in a Goethe Institute), or we could move near my undergrad alma mater and take up the study of the classics -- both things that have enticed us since undergrad days long ago but which we haven't had sufficient opportunity to pursue. Learning something new is one of the great attractions of retirement!</p>