World Senior Citizen Day is observed annually on ______ date ?

1) August 21
2) August 20
3) August 19
4) August 18

Explanation:
The World Senior Citizen Day was observed on August 21, 2019 across the world. The day is recognized to create awareness of the condition of elder people and support them through senescence.The day was first announced on 14th of December in the year 1990, by the United Nations General Assembly(UNGA) & it was celebrated for the first time on October 1, 1991.The day originates from the time of 1988. It was formally settled by the former president of the United States of America i.e. Ronald Reagan. He had marked the 5847 declarations on August 19, 1988, which showed August 21 as the National Senior Citizens Day.