Fix grammatical errors in this sentence: Until recently, the problems of aging population have become a major concern among all the nations throughout the world.
The government of, who is the leader of the, has been the leader of the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the, the
The United States is the only country in the world that is still aging.
The United States is the only country that is still aging.
The United States is the only country that is still aging.
The United States is the only country that is still aging.
The United States is the only country that is still aging.
The United States is the only country that is still aging.
The United States is the only country that is still aging.
The United States is the only