These two absolutely could handle a child with special needs more than the majority of couples that exist. They have no predetermined schedules, make huge money and went on 30 vacations in a year. They would absolutely have a horrible time figuring this out, Tim would probably lose it, but they could handle it better than almost anyone due to their lifestyle. So many people handle these situations as a single parent, with no money, with intense jobs. I am not going to preemptively assume they would not be able to handle something like this when they have the most perfect set up to deal with it of anyone. And to assume they will have a special needs child just because Jenn is 38 is also pretty presumptuous. Very young mothers have a high risk of this, too. It is their choice to make, and if Tim somehow doesn't have a choice I won't feel sorry for him since he is a grown adult who could put his foot down if he wants to.
And I won't assume to know whether either of them would love and nuture their child, issues or not. Nobody here can know that from watching them on YouTube, even if they do stupid and obnoxious things.