Fo Día / Fó / Día do bethu
Irish Gaelic has seanchara (old friend): the closest Scottish Gaelic found is seann-eòlach (old acquaintance)
"Hello" in English: "Hello". In Welsh: "Was Hael". In Italian: "Salve". Can't help you with Irish (Gaelic) I'm afraid.
I think you mean Hello it's Dia duit
how old are you
The native Irish name Brónach is considered an equivalent.Dia duit, a Bhrónaigh.
Gaiscíoch SíochánaLaoch SíochánaThat's modern Irish not Old Irish.
"Dia dhaoibh" (pronounced: deea yeev)
"Cén aois tú?" in Irish.
The most common language in Ireland is English, so "Hello" is used. In the Irish language, you would say "Dia dhuit", (pronounced: Dee a Gwit) which is a greeting that literally means "God be with you."
Dia dhaoibh a chlann (hello my children) le grá ó mham (love mum)
God be with you: Dia duit May God be with you too: Dia is muire duit That is also what people say to say hello in Irish if you say "Dia duit" the other person should say "Dia is muire duit"
If by 'Ancient Irish' you mean "Old Irish" it is "teg, tech". Modern Irish is tigh/teach.