Age is just a figure when it comes to mentality. There are many wise, profound 25 year olds, and ignorant, annoying, immature 60 year olds. It depends on experience and ability to process information, empathy, and emotional maturity.
Age does play a bigger role when it comes to physical health. It doesn't matter what you intellectual functioning is, your body still ages at a certain rate (which can be increased or decreased based on your habits). In this case, age is a valuable piece of information that plays a part in healthcare.