People
The man who views the world at 50 the same as he did at 20 has wasted 30 years of his life.
— Muhammad Ali

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The passing of years is expected to change how a person sees the world. Keeping exactly the same outlook is treated as a missed opportunity to learn from living. The contrast between two ages makes growth a question of understanding, rather than simply surviving longer.
Context reviewed