Baron Fermoy is in Baron Ireland.
On 10th September 1856 Edmund Roche 1st Baron Fermoy [aged 41] was created 1st Baron Fermoy.
On 17th September 1874 Edmund Roche 1st Baron Fermoy [aged 59] died. His son Edward [aged 24] succeeded 2nd Baron Fermoy.
On 1st September 1920 Edward Roche 2nd Baron Fermoy [aged 70] died. His brother James [aged 69] succeeded 3rd Baron Fermoy although he died two months later.
On 30th October 1920 James Roche 3rd Baron Fermoy [aged 69] died. His son Maurice [aged 35] succeeded 4th Baron Fermoy.
On 17th September 1931 Maurice Roche 4th Baron Fermoy [aged 46] and Ruth Sylvia Gill Baroness Fermoy [aged 22] were married. She by marriage Baroness Fermoy. The difference in their ages was 23 years.