It can only be changed by passing another constitutional amendment. The best example of this is the 18th amendment, which was later overturned by passage of the 21st amendment. (These amendments related to prohibition and then the repeal thereof.)
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The U. S. Constitution requires that after a proposed Amendment to the Constitution is approved by at least 2/3 of each House of Congress and is presented to the states for ratification, a minimum of 3/4 of the states must ratify it for it to become part of the Constitution. When the U. S. Archivist reports that he/she has received the minimum number of ratifications required for acceptance of the proposal, it is immediately part of the Constitution with no further action required by Congress, the President or the Supreme Court. Of course a lawsuit may be filed if there is evidence that the ratification was not validly completed as required by the Constitution. The 27th Amendment to the Constitution was accepted by Congress and presented to the states for ratification in September 1789. It was not reported to have been ratified until more than 3/4 of the 50 states had ratified it, the 38th state doing so in May 1992. Since the Union consisted of eleven states at the time Congress approved the proposal, this suggests that the minimum number of states required for ratification continues to increase as the total number of states increases, becoming at least 3/4 of the new total with each new statehood grant.
If you are asking about the United States, the change took place in 1971, as a result of the 26th Amendment to the Constitution, which gave 18 year olds the right to vote. There had been some discussion of doing this as early as World War II, but many historians credit the controversy over the Vietnam War with giving momentum to lowering the voting age. After the 26th Amendment was ratified in July 1971, it became official.
There are 27 Amendments, and 26 changes. Why? Because the 21st amendment repealed the 18th, so the 18th is no longer a change to the constitution
denying basic rights to people