I'll be 45 in a couple months and am probably the fittest I've ever been. I could stand to lose a few pounds, but that's my opinion, not my doctor's. I was down to 172 this Fall, but with the holidays and my typical lack of self-control, I've gained a few pounds (as in less than 10, but more than 2). I can lose that quickly as long as I keep my eating under control and remain active.
As for routine, I *try* to get into the gym 3x weekly for a weight-based full body workout (some bodyweight exercises like pushups and pullups, and a bunch of barbell and dumbbell lifts), then 2-3 miles running on the treadmill. That takes 2-3hrs depending on how busy it is and what lifts I'm doing (some require more rest between sets than others). From early Spring to mid Fall, I also try to get a couple bike rides and maybe another run each week. I do take a "break" from the gym during hunting season so I can spend more time in the woods. I tend to start back in early January, so I start off with all the resolution folks.
I'm not particularly strong for someone who works out as regularly as I do. Growing up, I was a skinny, lanky kid (graduated HS at 5'10" and 140lbs) with little natural strength even though I was active and spent most of my free time outdoors. Even now, if I don't keep at it, I lose any gains quickly. I was born 2 months premature with a heart defect. I don't know if that contributes to things, but I'll blame that rather than admit I could do more at the gym. :D
Every year, I run the same 5k and use it as a barometer of my progress. Every year, I'm faster. I also enter a few other 5ks here and there. I've started placing in the top 3 in my age group pretty frequently and took 1st in my age group in an offroad 5k last Spring (took 2nd a when I ran it a couple years prior).
As far as "healthy", my cholesterol is a tad high (or was before I started taking medicine for it) and my blood glucose was in the "prediabetic" range. My A1C has responded well to a low doses of Metformin and a modest change in diet. BP and heart rate are great (former is solidly in the normal range and the latter is in the "athletic" range), and my physical each year gets good marks from the doc other than the two issues mentioned above. I need to eat better, but I eat better than most as it is. I read labels obsessively and tend to avoid carbs, sugars, and starches whenever possible (except when my willpower flags).
Could be better, could be a lot worse.
Chris