The three-car crash happened this morning
The elderly man was a front seat passenger in one of the cars which collided at South Lodge in Carrick-On-Suir at around 6:50am.
A man in his 20s who was the passenger in another car was taken to St. Luke's General Hospital in a critical condition.
No other serious injuries were reported.
A man in his 30s was arrested at the scene and is being detained at Clonmel Garda Station
The road's closed and Gardaí are appealing for witnesses to contact them.
