I'm 43, I've been roleplaying in some form or another for over 20 years, and GM'ing for most of that. I've played in a wide variety of systems, but the one that I have the most experience with by far is the 40K RPG lines, having picked up Dark Heresy when it was first released and played every update since. I'm also a huge Mass Effect fan, and I do a lot of homebrew mechanics.
As for play style, I like a mix of things - immersion RP, character development, action/combat, problem solving, exploration. I try not to rules-lawyer, but I do prefer that people actually know and understand the system they're using. If a mechanic doesn't work or doesn't make sense, I'll generally look very deeply into how it interacts with the rest of the system before I'll house rule it, but I will make a quick adjudication for the current situation just to keep play moving. All that aside, I think the most important part of a successful RPG is emotional investment in the shared world that you're creating. You have to care about the characters and what happens to them, otherwise why are you playing? As a result, sometimes my sessions may have no combat in them at all and minimal dice rolls, while other sessions may be almost entirely combat or problem solving based on the needs of the story.
I have found that I prefer text-based over voice RP for three reasons: First, immersion is generally much greater when you can stop and think through what a character is saying or what you're describing and make quick edits to fix the flow of words before committing to anything. Second, text makes it easy to keep a chat log of events to refer back to after the session is over. Third, I had no idea how much time gets wasted on out-of-character conversations until I compared a session of a Voice group and a Text-only group running through the exact same material and the text group got almost as much done in a session that lasted half as long.