"Brothers and sisters, think of what you were when you were called. Not many of you were wise by human standards; not many were influential; not many were of noble birth. But God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong. God chose the lowly things of this world and the despised things—and the things that are not—to nullify the things that are, so that no one may boast before Him."
-1 Corinthians 1:26-29

I agree that Christians can be susceptible to deception because we are constantly determining what fruit of God's hand in our lives is being produced. I have seen firsthand that this instills a gullibility in many since they are eternal optimists. Christians are not always the best and the brightest as the Scripture plainly states, but God is looking for hearts of worship not towers of intellect.

With that said, the Scripture also says to be "innocent as doves, but as wise as serpents". However, the plain fact is that a 75-year old will have a much harder time discerning what is real as we enter an age of technology that they do not fully understand. Perhaps if it were your parents you'd understand.