Stamina is one element that I believe more mature people may have a better handle on and thus may be leveraged on.
For example, parents or grandparents for that matter (I am not neither of them) can tell you what sort of endurance and patience that they need to have to take care of their children. Such emotional and psychological stamina can be applied in other circumstances including work place. Use it wisely and don’t throw away something valuable that you already have.