I'm also something of an old soul. I've been through enough in my life to have learned that the best way to live life is to learn from it, roll with the punches, grow as a person, and focus on appreciating all the positives! I'm almost always cheerful and don't get upset easily.
I can also be pretty quiet. I'm an outgoing guy, and I love meeting new people, but am definitely an introvert. It takes a lot of energy and effort for me to be really social, so recharging occasionally by myself or in a low-key setting with a few close friends is a must.