Anigu ma waxaan ahay faraxsan
(This is Somalian but it was the best I could find)
manuia
Happy 18th Birthday in English is translated as "Ia manuia Lou sefuluvalu (18) tausaga" in Samoan
Manuia lou 60 tausaga
Manuia lou asofanau, Sakalia.
Manuia lou asofanau muamua.
Ua ou fiafia i lou fa'atasi mai
"Happy birthday, Sister" - "Manuia lou aso fanau, Uso"
Uso, Manuia le aso fanua
Ia maua se tafaoga fiafia
Anigu ma waxaan ahay faraxsan (This is Somalian but it was the best I could find)
To say "happy 21st birthday" in Samoan, you can say "Manuia le 21 o le aso fanau." This phrase conveys your wishes for a joyful celebration of the 21st birthday. If you're addressing someone directly, you might add their name for a more personal touch.
"O lo'u fiafia ia e nofo to'atasi." Love is alofa; fiafia is happy. I have used the word "fiafia" to translate the meaning of love in the sentence, to convey the fact that it is not in a romantic context, but a happy one.