You might be mostly right about the kids, however your conclusion assumes that yahoo can't grow + yahoo's acquisitions also won't grow + older generation's internet use will decline over time, all which you haven't even discussed.
Even the yahoo name is worth more than $0. What crack do you people pull your numbers out from?
An intelligent person generally waits for someone to be wrong before ridiculing them. Now if that person you seek to ridicule is right time and time again you may be waiting a long time, or you can do as you did and look like the clown yourself.
So does Google support work with you over the phone? Facebook? What are you comparing this "worthless" company to?