nounGrand Birthday Celebration for elders.
nounFor male, the Grand Birthday Celebration will be on the 60th, 70th, 80th, 90th, 100th birthday, for female, will be on 61st, 71st, 81st, 91st, 101st etc.
nounnoun; Big birthday, normally, a "big" birthday above 50 years old for every 10 year interval, i.e. 60th, 70th, etc