No matter what age you are you can explore the Giants Causeway . You can get there with a buggy, but the best to explore the place is to walk on the cliffs and do your 10k walk or so. Many way to visit, depends on you. Worth to see this unique place as no other place in the world give you the same brilliant view. The mother nature can surprise!
If you need a cheap accommodation Finn McCool's Giants Causeway Hostel is just by the entrance (but you won’t find it on booking.com).
Once you there take your time to visit Dunluce castle ; White Rock Beach which are close by. There is also Line bridge Carrick-a-Rede- but I didn’t have time to visit myself.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.