At 54 I have noticed a few changes with the years. Fortunately I have this metabolism that allows me to eat pretty much anything without gaining weight. Unfortunately I have this metabolism that allows me to eat pretty much anything without gaining weight. Bodybuilding was/is definitely not an option, but I still work out and my business keeps me physically active. Over all I'd say I have an ok physique for a man of my advanced years. All that being said, I still notice the occasional ache and pain however I find that stretching and bike riding helps an enormous amount in that area. It doesn't have to be weights and marathons. I think if you cut back on your physical activities because it hurts a bit starting and afterward or if you feel too 'tired' then you begin the downward spiral to being physically unfit and weakness. All those people have something in common: They keep moving.