I'm in my late 40s; I stand these days at a smidgen under 6'' and I weigh 220 pounds (lay off the friggin' burgers, T). However, despite being one of the larger guys in the room in my circle of friends and family, I easily have below-average wrist size; I don't know specifically what size, but all I know is I can abide a 50mm, but not all that often and certainly nothing bigger than that - I think honkin' big watches are tasteless anyway. My sweet spot is about 43mm to 46mm, but I actually like the way old 38mm and even smaller pieces such as an old Hamiltion, some ancient Omegas, and other older pieces lay on my wrist.
I'll put things this way: I don't own a ranch, so I don't wear a cowboy hat. I'm not an astronaut, so I don't reach for my space helmet. So, I don't dive - and I don't own many dive style watches; I don't time anything, so chronographs don't do a lot for me either. As koi mentioned, I prefer dress pieces or simply handsome, masculine watches with classic styling. My grail at the moment is any one of several Glashutte Original timepieces.
In that light, I prefer Swiss auto movements to quartz, but a 2824-2 is just fine by me (and guess what - my best running auto that've calculated is friggin' Claro, amazingly), despite the overwhelming hype/love for chrono autos. In addition, I'm happy enough to own an ancient Rolex Submariner and a couple of aging Omegas, but I can't say I'm in any hurry to pick up any more from those brands. I am happy in my world of the less expensive semi-Swiis Oris, Hamilton, Tissot, Phillip Watch, and a couple of other similar companies - but once in a great while, I see a nice, dressy or handsome quartz piece and I pick it up. Life's short and I want to have as much fun as earthly possible.
"Funny how things that start spontaneously end that way. Eat a peach." - Neil Young