![]() ![]() FEV1 declines 1 to 2 percent per year after about the age of 25, which may not sound like much but adds up over the course of a lifetime. Forced expiratory volume (FEV1): the amount of air you can exhale with force in 1 second.Forced vital capacity can decrease by about 0.2 liters per decade, even for healthy people who have never smoked. It is about 80 percent of total capacity, or 4.8 liters, because some air remains in your lungs after you exhale. ![]()
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