hey Scaz, I've been lifting weights for a little over 30 years and I can tell you that any activity you do is good for you, particularly the activities we discuss on this board, it's good for body and soul
If you haven't been to the gym in a while, start slow, you don't want to get too stove up. But, go! I've had to drag myself in many times and feel better when I leave. Sometimes it's the release of endorphins; sometimes it's just the accomplishment of getting that workout in. I've worked with many guys my age whom have wanted to get into shape. Start slow, use high reps and light weights. Pain tells you to slow down. The burn tells you it's good for ya.
People say "I bet you don't have any aches and pains." I do, but they're different from normal. Instead of back pain from a gut, I have tendonitis. Sux getting old...
I do a split-routine, four days a week. Chest, back, and shoulders on Monday and Thursday. Arms and legs on tuesday and Friday. Wednesdays and weekends are off. Eat right and take some protein, drink plenty of water. Best of luck, and remember: "Sun's out, guns out."