Make sure they have ample medication if they take any, along with copy of prescription if needed. Maybe ibuprofen gel for aches and pains for standing/walking all day and make sure boots are well worn in. I am not 70 yet but sometimes my body feels like it.
Wonder if they're going for a similar thing to what Mad Cool did a few years ago, where the vague clues could deliberately be any of the bands linked with it (Fontaines DC, Kneecap or Inhaler) and it ends up being 2 or 3 of them