I would gleefully slap another $50-100 onto every plane ticket I ever bought to ensure that there was nobody anywhere on the plane under the age of 16. I can't be the only one...
What is your thesis here, I shouldn't be annoyed by children because one day I will be old? Not sure I understand that logic. "Being annoyed" isn't even a proper choice; if I could turn it off, I certainly would. In fact, I would say that the ability to turn if off for a few hours at a time is worth about $50-100 to me......
Of course on many/most planes "first class" does not get you isolation from children... (certainly not for that low a price) but at least you get unlimited liquor and legroom. I'd be willing to pay more for a flight without children but I would want some unlimited liquor once I go over 200 or so.
On this note, what would be the booze situation on hyperloops? There isn't an aisle on those things as far as I can tell, which means no stewardesses... Maybe per-seat minibars could be installed on them? Strictly speaking it wouldn't be necessary for 30 minute rides, but I see no reason this idea shouldn't be scaled up past 30 minute trips (Musk points out that supersonic airliners are better at longer distances, but since we don't have those either I'd settle for a 30+ minute hyperloop. Both a hyperloop and a return of Concord/Tu-144 would be great of course.)