How do you say happy 90Th birthday in Spanish?

Answer 1

Felicitaciones por sus / tus / vuestros / nuestros 40 años de vida.

IT could be a possible translation, depending upon the speaker.

Very literally, but less frequent:

Feliz cumpleaños número cuarenta.

Answer 2

Felicidades por sus noventa años.

"Tus / vuestros" can be also used, depending on the context.

Answer 3

Felices bodas de oro (Literally: Happy Golden Wedding Anniversary)

(Pronounced 'fayLEEthess BAWdhass dhey AWraw')

('th' as in 'thin') ('dh' as in 'the')

Answer 4

50 o cumpleaños feliz

Answer 5

Felz Anniversio de Cuinta!!