Fourth Amendment of the Constitution of Ireland

For the earlier rejected fourth amendment, see Fourth Amendment of the Constitution Bill 1968.

Fourth Amendment of the Constitution of Ireland
7 December 1972 (1972-12-07)
To lower the voting age from 21 to 18
Results
Choice
 Votes %
Yes 724,836 84.64%
No 131,514 15.36%
Valid votes 856,350 94.79%
Invalid or blank votes 47,089 5.21%
Total votes 903,439 100.00%
Registered voters/turnout 1,783,604 50.65%

The Fourth Amendment of the Constitution Act 1972 is an amendment to the Constitution of Ireland which lowered the voting age for all national elections and referendums in the state from twenty-one to eighteen years of age. It was approved by referendum on 7 December 1972 and signed into law on 5 January 1973.