Am a male about 40 years old and have noticed in the last year that I seem to be tired at an earlier time in the day, lack energy and drive to do things even mow the lawn and have myself eating and gaining wait with no interest in losing weight. In fact I bought a treadmill one year ago and have usedit only 5 times. Look for a good discussion.
I think your fatigue maybe normal for a guy of your age. Maybe you should ask you doctor about those pills being advertised on tv that's are supposed to give you energy. You also want to make sure you get plenty of sleep during the night and drink some water.
Four years ago I had the same symptoms with fatigue and like to have nabs 3 to 4 times a day. I consulted my doctor she did different blood tests and I was diagnosed with thyroid. Mine was underactive, for that I gained a lot of weight,stressed and tirdness.