If you are going to use Rx meds for preventive care what you need is some more data (labs) and a progressive physician. Don't treat yourself.
I'm clearly not one to shy away from pharmaceuticals for health optimization, but statins are a drug class that I would hesitate to take unless you have very very high cholesterol levels. That drug class is not benign and the data on cholesterol levels and MI's is somewhat weak. It's true that data on statin use seems to be beneficial in avoiding CV events but you should look into wether this may be due to the fact that statins have anti inflammatory effects, and may be irrespective of cholesterol levels. Realize, too, that statin use has been historically pushed very very hard by Big Pharma and the NNT is around 110 last I checked. There are generations of cardiologists who may still worship at the statin altar, but what is the science really saying these days. Again, look at your risk factors and pay attention to the SE profile of statins. Not harmless.
For Metformin, the people who will benefit most are people with some level of insulin resistance. How do you tolerate carbs? Do you tend to gain quite a bit of weight after eating a high carb diet (low fat)? What are your fasting blood glucose levels?? If you consistently are in the mid-high 90's and FOR SURE over 100, then you have insulin resistance to some extent. It's a spectrum. Check fasting insulin levels for indications of some level of hyperinsulinemia, a sure sign of insulin resistance, and also check A1C. The lower the better.
If you find that you have insulin resistance (and it tends to increase with age), then consider metformin, but have this discussion with your Dr. Many are aware and are treating prediabetes. Studies on actual weight loss seem equivocal. But, if you restrict carbs (you must do that if you are insulin resistant, there is no choice) and take metformin, you can very well lose weight with exercise.
If you catch insulin resistance quickly before you become hyperinsulinemic, then DM-II is a CHOICE (with the knowledge that we have today). But, again, the natural history of this "disease" is normoglycemia for a long time (5 or 10 years?) before hyperglycemia. By the time you are consistently warranting of a DM-II (FBG>126 on multiple occassions) you will have been hyperinsulinemic for years. And by virtue of that, you will have had a very hard time losing excess weight. By that time, also, you will have greatly taxed your B cells potentially to the point of no return (Insulin dependency), and at THAT point it will be very hard to reverse course.
So, you need to understand the disease, and your genetic propensity, and catch things early. Don't f.ck around with HTN or DM. We all see the effects of those two comorbidities. Put pride aside and do what you need to do. Not all meds are bad. ACEI's and ARBs have a very favorable SE profile. Not all do, however.