A first world problem to be sure. Having stayed at the Lani when youngish and the Kea when oldish, I’d lean towards the Kea for anyone elderly. First, it’s an older crowd that is staying and there will likely be less children. Also, the mid-century architectural grandeur could be a welcome nostalgic throw back and (if I project 20 years ahead) trumps the admittedly better Lani pool, right off the beach snorkeling and grounds. The Kea’s art collection (and they should take the docent led tour) is another plus. If the Kea, I’d try to park the oldsters on the same level as check in and not too far out on the wings.