&quot;Never retire.&quot; My in-laws are in their mid-70s, but don&#x27;t act like it at all. They both work numerous &quot;jobs&quot; (they own a farm and do other volunteer and outreach work, and my father-in-law builds ponds and bridges and whatnot for other local farmers).<p>My father-in-law did have cancer, but is in remission now, and sped right back up to normal pace.<p>It&#x27;s obvious to my wife and me, though, that if he ever &quot;retires&quot; he&#x27;ll likely go down-hill pretty rapidly. The women in my wife&#x27;s family all live well into their 90s (her grandmother is currently 101) and there&#x27;s no doubt part of it is their stubborn inability to slow down.<p>Never retire. Maybe you can afford at 65 to remove the golden handcuffs and take up a different vocation, but don&#x27;t ever stop working and learning.