I learned that time is the ultimate key to wisdom.
(get ready for some philosophy, peeps)
Think about it. Wisdom is learning from your past mistakes and basing that knowledge on what you do currently, as well has having knowledge, right? We gain knowledge over time.
Except, I also learned that some people don't "have the time" to gain knowledge. i.e., people with busy lives or busy jobs. Their life, their job, takes up so much time and importance that they don't have the time to reflect on mistakes or knowledge that they have gained that day. However, I am NOT saying that having a busy job is a bad thing, just that sometimes people need to settle down and think.
But consider elderly, retired people. We often view them as wise, because of their experience and the knowledge they have gained over their lifetime. But also, retired people have all the time in the world to gain knowledge and wisdom, because they are not limited by jobs and events.
Just going to put this out there for those who want to read it. :)