It depends on many things. Generally, we see older people act from their wisdom but the same thing can be practiced by young people too. Wisdom is not only intelligence or knowledge, but a mix of both these with experience, compassion and tolerance. People gather all these things with age and that's why it's a common perception to associate wisdom with old age.
Life is full of experience and knowledge and the more one can apply the knowledge in different situations, the more experience one gathers. Realization of everything that we perceive is very important and the more you realize, the better. Many people realize things much later in life because they do not pay enough attention to things at the beginning. Whatever we are doing, we must follow the process or know the process before doing the job. If we do not follow that process, there is every chance of making it a mess.
Wisdom comes with paying attention to things, paying attention during success and paying attention to know the reasons of failure. So, the more attentive you are about the details, the more chances are there to use the experience in some other places.
"Life is easier when you enjoy what you do"