Bain sult as do nóchadú breithlá (or Bain sult as do 90ú breithlá)
sult as a command Bain sult as - Enjoy (it)!
"Bain sult as an oíche amaitéarach" means "Enjoy amateur night"
Bain sult as do dhaicheadú breithlá (bain sult as do 40ú breithlá)
Bain sult as d'ochtú breithlá déag (Bain sult as do 18ú breithlá)
Bain sult as do 45ú breithlá (Bain sult as do chúigiú breithlá is daichead)
In Irish it's "Bain sult as do chaogadú breithlá" (or Bain sult as do 50ú breithlá)
In Irish it's "Bain sult as do naonú breithlá caoga" (or Bain sult as do 59ú breithlá)
bain sult
Bain sult as.
In Irish it's: Bain sult as (singular) / Bainigí sult as (plural)
In Irish it's "Bain sult as d'ochtú breithlá déag, Leen" (or Bain sult as do 18ú breithlá, Leen)