Actually, if you use steroids wisely, it will be very beneficial for a 50 years old guy. Just make sure you don't have any serious pre-existing health issues, and use moderate dosages of steroids. You will see how the overall feeling will improve, your libido will be like in the young years, and you will have an easier time working out. Remember, as you age, you start losing natural testosterone, so by this age your natural test levels are very low, and by taking steroids you will recover the good levels of the hormone. All in all - as long as you keep things within reason, you will be greatly benefited by the steroids.