"Policies tend to cover any driver over the age of 25 years." Be careful that usually the driver must have held a full licence for 2 years - read the small print.
If you come and go remember to allow for costs of airport garaging (c. €350 per year for unlimited coming and going), ITV (depending on age of car) and servicing. The date when ITV is due may not be when you are here to take it.
It does work out as a saving but you have to do all the math!