What makes this observation unusual is its implicit rebuke of the tired arithmetic we use to dismiss ourselves—the mental ledger that says a certain age means a certain ceiling. Lewis isn't simply cheerleading; he's noting that the capacity to want something genuinely new doesn't atrophy the way our knees do. A sixty-year-old who learns to paint or changes careers isn't reversing time through willpower alone; she's recognizing that desire itself remains a fresh faculty, untouched by decades. When your neighbor takes up pottery in retirement, he's not fighting against aging—he's honoring Lewis's quiet insight that the hunger to build something can arrive as readily at seventy as at seven.