James Moylan (b1816 Laois Queens Co) son of John, married Margaret Peavoy in Dublin 1848 - emigrated to Australia 1850/51

James was 32 when he married, which seems late? Marriage certificate attached.

The only ancestor info I can locate is that James mother's name was Mary Brannan, father was John.

All I have for Margaret Peavoy is her father is John, and was a shoemaker.

James & Margaret had one child in Ireland (Mary Elizabeth Rose b 1849) before shipping-out to Australia. Their 2nd child (Margaret) was born in Adelaide South Australia (b 1851), then the remainder of their children born in Victoria. I cannot locate any records showing which ship they were on.    

I have been searching for years, so any assistance would be much appreciated!