A anniversary celebrating that you have had a successful relationship for a long period of time.
I want to mark your anniversary on my calendar.
The cast of Mark Russell 20th Anniversary Special - 1999 includes: Mark Russell as himself
A Golden Wedding Anniversary is 50 years.
sapphire.
jubilee
It was their 75th Anniversary. They were founded in 1933 by Art Rooney.
On April 20, 2099.
To mark the 50th anniversary of some thing
First year anniversary is when you have been with your partner for a year and you celebrate the long lasting relationship on the day you started dating: your anniversary
Thirty years.
On September 11, 2101.