In fact, young men seem to react the best to this medication. This may mean a man as young as 18 or a man as old as Side effects Side effects of oral ED medicines are often mild. Oral medicines for ED usually work well and cause few side effects. Medicines that you take by mouth are called oral medicines.Who can take sildenafil. Most men aged 18 and over can take sildenafil for erectile dysfunction. Most adults and children aged 1 year and over can take sildenafil for pulmonary hypertension. Who may not be able to take sildenafil. Sildenafil is Missing: minor.  · Viagra Triangle got its name as it has always been known as a place where “older” men in the upper class would either hang out or go on dates with younger women in their 20s and 30s. It’s Missing: minor.  · A Madison lawmaker talking up her proposal to exempt menstrual products from the state sales tax drew a comparison that caught our attention. In a July 27, post on X, formerly known as Missing: minor.