Hi Oonagh,
It is unfortunate that Cork no longer receives ferries, have you however, considered
sailing into Rosslare and taking the wonderfully scenic drive to Cork? It takes about 2 hours 30 minutes but is well worth the time as you will pass through some wonderful towns and locations on the way!
With regard to renting a car, we have a previous community post on
renting over the age of 75 that has some excellent information. We also have an article on
Renting a car in Ireland that has some information regarding additional medical information required by rental car companies prior to arrival in the country.
I would also suggest contacting the
Car Rental Council of Ireland who will be best able to advise on information regarding rental companies.
I'm sure many of our members will be able to offer some advise too,
Martin