It makes perfect sense.
I am sure that sometimes old has something to do with it if we lose a little of our ability to discern the truth of things, but that would be a little more of an issue than just aging.
I think being exposed to the internet for years might help us be more aware than before as we have gotten to see all the ways bad people have/are scamming and cheating others. I know I'm suspicious of everything thing ! LOL
I don't believe caution is a bad thing when applied to certain situations and circumstances and suspiciousness is a form of caution right?