You heard rubbish, why would it be worse for younger men, who have higher metabolisms ? It's safe, just make sure you are taking the right stuff and do not exceed standard dosage.
viagra will not give you an erection until you have a stimulus
then it will give a strong erection.
after ejaculation, you will be able to get an erection almost straight away (as long as you have a stimulus)
when there is no stimulus, there is no erection
there are things to consider.... if you have a bad heart (or family history of heart attacks) it can be dangerous to take viagra
viagra can cause some severe headaches
but.... erections which wont go down?... that just ridiculous
well the viagra relaxes your blood cells but no do not take it it will be dangerous and 5 cups of watermelon has the same effect without the drug part of the effect