Hm, Ingold wouldn't necessarily be
that old - somewhere between fifty and sixty, I'd guess (although that probably still makes him an old man from Thiliel's perspective
); and if he had younger siblings, it wouldn't be at all extraordinary for him to have a 14 year old niece. In a large family, it's not unusual for the eldest and the youngest child to be ten years or more apart.
As for when to enter, it's up to you. Harrenon and Coldan will be thirsty, so you could take their orders once they've joined Amdír and Rollan in the common room. Or you could run into Sereth while she's stalking Sador to his room. Or, since it should be about noon by now, you could take a meal to Brinn who's staying with the wagons and can't walk to fetch herself one. Or whatever suits you best.