Happy 18th Birthday in English is translated as "Ia manuia Lou sefuluvalu (18) tausaga" in Samoan
"Happy birthday, Sister" - "Manuia lou aso fanau, Uso"
Asofanau fiafia or asofanau manuia.
Manuia lou luasefulutasi tausaga
Manuia lou 60 tausaga
Manuia lou asofanau muamua.
Uso, Manuia le aso fanua
Fiafia/Manuia lou luasefulutasi, Charmaine.
Manuia lou asofanau (Happy birthday to you) Manuia lou asofanau (Happy birthday to you) Manuia lou asofanau (Happy birthday to you Fa'amanuia le Atua (God's blessings to you)
May you have a blessed/happy 16th birthday. Blessed is manuia; happy is fiafia.
Asofanau
Happy birthday to you Happy birthday to you Happy birthday dear (person name) Happy birthday to you