My great-grandfather, Peter Ager, was born on a farm in Carlow, Ireland in 1866. I do not know how he may be related to the people you are researching. But, given the similar dates and location, they may be related. I do not know Peter's family history in Ireland. I have a cousin who is strongly interested in genealogy and he has visited Carlow.
Peter Ager married Letitia Purcell, also of Carlow (b. 1867 or 68). He left Ireland for NYC at age 17, and died in NY in 1963. I remember him.
There are many offspring in the NY area. The only ones left with the Ager name are myself, my two sons, Lucas and Colin, and some long lost cousins of mine in the Florida area, James and Brian.