One of the things we found while talking to folks over the last few months about what we were doing was that there are a lot of reasons not to do this thing. The market is really difficult. Getting your app an audience is really expensive and hard. Most games fail. The thing you're trying to do is too much like or not enough like some other thing. Getting a team in the Bay Area is really hard and expensive. You've got two kids & are old, you're not going to be "hungry" for success like a younger entrepreneur.
Blah blah blah.
Here's the thing: Take any idea, and dissect it, and you can find a billion different reasons why you won't succeed. Why you shouldn't even try. If you go back to even as recently as 2012, and listen to what people were saying about Tesla, the vast majority of folks online (90+%) were saying it was a scam, it was impossible, that there was no way they could deliver on their promises. Look at what they've accomplished, instead.
A lot of people think they're really smart because they can see all the problems with the thing that you're doing. I think it's trivial to find problems with things. There are many ways to say no. There are many ways to fail. And if everyone listened to the naysayers, nothing interesting would ever get done.
At some point, you have to believe in what you're doing. You have to understand that most of the "no"s are things that can be fixed, or assumptions that can be challenged. You have to see the opportunity others don't see. And you have to find people who are willing to look into the future with you. You have to find people who are willing to see beyond the obvious reasons to say no and find the reason to say yes.