I think primarily in words. There's never a moment when there are no words and just an image. I can't reason silently, in my head. When I problem-solve, I prefer to use a hypothetical situation. So, in my head, I usually hear my own voice explaining my thoughts and feelings as if someone where there listening, much the same way I am typing this post now. Often times, I even create a visual scenario in my head. I imagine the how the tone of my voice, my gestures the position of my body would affect people. I see their body language and can hear their reactions in their voice.
Perhaps, this just qualifies as normal daydreaming. Even if so, that's how I approach almost everything. I would never use numbers, graphs, lists, etc.
When trying to understand a complicated idea, it helps to formulate an image in my head or use metaphors. It's actually almost essential if I am reading or listening to someone speak, such as during a lecture.
Funnily enough, I am nineteen years old and male. I definitely do communicate with my body. Unless I am uncomfortable, my hands and head move every which way while speaking. If I'm talking while I'm not seated, my arms and legs will be everywhere too.