The birth of a baby is a occasion that deserves a celebration, when the family comes to great the new baby and the new parents.
Becoming 15 is a celebration of a girl's 15th birthday in some cultures. At 18 years you become an adult with all the rights, vote, buy a house, or wed the girlfriend. At the age of 21, you can legally drink and gamble.
Graduating from college can be celebrated with taking a trip with friends or throwing a party, considering your old enough to drink alcohol.
