You retired at 68, correct? A lot of folks joining the Forum and contemplating retirement are 50-55, a full half-generation younger than you were, at point of retirement. They're going to have more soul-searching and more contemplative deliberation, even if they're fully prepared financially. You were ready. You knew that you were ready... so, you took action. You have no regrets.
Even the fellow who retires at 80, is leaving money on the table, compared to his colleague, who collapses in his executive-chair at 85. Whether it's a pro-athlete who retires at 28, or the lawyer who makes his final court appearance at 88, we all face opportunity cost. We all face the question of how to occupy our time post-retirement. We all face the what-ifs of career advancement left unpursued. And so on.
The older that we get, the smaller this opportunity cost. There is less questioning about whether we're right. We fit-in better with the modern white-collar-professional narrative (doctor/lawyer/scientist/engineer) that meaningful formal remunerative work needs to be pursued at long as possible, but the imperative ends at some canonical age... so, if we exceed that age, or at least closely approach it, we're good. And if not, not.