My late wife of almost 50 years made 3 trips to Ireland, all after turning 65 and alone except 1 trip.
. First trip was booked thru a travel agent and was a typical bus tour type, which she enjoyed, but not so much some of the pita people on the bus.
Second trip another bus tour to a different area, and this time our daughter went along, which made it more enjoyable for her.
Third trip was over the time frame of her 70th birthday, she went alone, rented a car, stayed at the numerous bed and breakfast homes, and had the most enjoyable trip of all traveling where she wanted and at her own pace. She loved Ireland and the Irish people, so much so, that
when she died very suddenly due to an accident, we decided that a part of her should be in Ireland. So our daughter and son in law made another trip, went to a nice park they had visited together on the earlier trip and made that happen.