I don't there is truth to that. Wisdom is psychological. Psychological development occurs with age of course, as a 1 year old isn't as experienced with the world or themselves. But you don't need to be 30, 40 or 50 to gain wisdom of what is right to do ;) It's base don information from our environment that allows us to learn. Reality teaches, but are we paying attention or looking to learn actively? Time is required. Put in the time early and you can become wiser earlier.