One way to wish a couple "all the best" in Irish when they get married is:

Go maire sibh bhur saol nua. (CO)
"May you enjoy your new life" (to more than one person)

If you were bidding a friend farewell when they were going overseas, you could possibly use the same phrase but it would need to be put into the singular:

Go maire tú do shaol nua. (CO)
"May you enjoy your new life" (to one person.)

Confirmation or correction welcome ...

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Right, as far as Standard Irish can be right (I'm thinking about "bhur", which no native speaker uses, I'm afraid).

You might also say "Bain sult as do shaol nua".

In Ulster you'd get:

Go mairidh tú do shaoghal úr / Go mairidh sibh mur saoghal úr (GU)

Bain sult as do shaoghal úr / Bainigí sult as mur saoghal úr. (GU)

I use the old spelling "saoghal" instead of "saol" because in Ulster, normally that word has kept the 2 syllables since Old Irish, when other dialects have only one (Ulster /si:əl/ vs. C /si:l/ and M /se:l/).

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Yes, the Connemara versions would be:

Go maire sib a saol nua (plural version). (GC)

Go maire tú do shaol nua. (singular version) (GC)

Bain taithneamh as a saol nua. (plural version). (GC)

Bain taithneamh as do shaol nua. ((singular version). (GC)

Of course, most people would write them in Standard (CO) but say them this way. Taithneamh would be taitneamh in CO.

(I don't think sult is used much outside Ulster. )

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

typo: you forgot the séimhiú on "saol"

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Ah, yes, so I did. Fixed above.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Nuair a phósann daoine, deireanns 'chuile dhuine thart annseo
Go mairidh tú do nuaidheacht/ Go mairidh sibh 'ur nuaidheacht

Ciallaíonn nuaidheacht "an nuadhacht (nuacht)"- "The news" anso i gCúige Mumhan go háirithe i gCiarraidhe

'bhuil an bhrígh chéadna ag an bhfocail nuaidheacht is athá againne, ach ins an comhthéacs so an gciallaíonn sé- tosnughadh nuadh nú rud éigint don tsaghas san?

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Please wait for corrections/ more input from other forum members before acting on advice

A Seaghain, if you want to make your suggestions stand out more clearly against your comments, you might try using the bold [ b ] tag around them. (It's in the forum rules. )

nuaíocht can mean both "news" and "novelty". FGB has Go maire tú do nuacht as "May you enjoy your new acquisition." I guess that's one way to look at it!

Joking aside, though, Go maire tú do nuaíocht (GC) and Go maire sib a nuaíocht (GC) are probably better for weddings.

What prompted this thread, however, was actually a request elsewhere for "May you enjoy your new life" in the singular for a very special context. Sorry, you weren't expected to know that.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Nach n-abartar "go mairidh tú an scéal(a)" ?

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne