Thai Air celebrates its 50th anniversary this year.
Our company had the fortieth anniversary of the foundation.
On the tenth of next month they will have been married for twenty years.
Our school is 80 years old.
We celebrated our tenth wedding anniversary yesterday.
A toast to your 20th Anniversary!
Today's ceremony marks the 100th anniversary of our school.
A very elderly couple is having an elegant dinner to celebrate their 75th wedding anniversary.