cnedach
how old are you
Gaiscíoch SíochánaLaoch SíochánaThat's modern Irish not Old Irish.
thirty bliain d'aois
"Cén aois tú?" in Irish.
If by 'Ancient Irish' you mean "Old Irish" it is "teg, tech". Modern Irish is tigh/teach.
Sean also aosta
uasalathair
Yes,they do.
Irish Gaelic has seanchara (old friend): the closest Scottish Gaelic found is seann-eòlach (old acquaintance)
In Irish, "An ceann deireanach";In Scottish Gaelic: ?
In Irish, you would say "Tá mé 42 bliain d'aois." This translates directly to "I am 42 years old." The phrase "42 bliain" means "42 years," and "d'aois" means "old."
Fo Día / Fó / Día do bethu