I agree. Duh, the program is obviously not perfect and screws up sometimes. But I'm amazed by how good it actually is. Even being able to just ballpark it some of the time would be impressive, but the fact that it gets pretty reasonably close most of the time, I find that incredibly impressive.
Someone on my Facebook feed was complaining about how in a washed-out picture of three children the picture guessed only two of them right, but saw one (a young boy) as an adult woman. My response was to crop out just the washed out face, take it out of context, and point out, if you saw this face, not understanding anything about the context, could you guess it? I certainly couldn't have. But that's exactly what the software has to do.
I took a number of pictures of myself in different angles, making different faces, etc, and its range on age guesses was only 3 years. My brother-in-law managed to get a 20-year difference in guesses by making faces, but I couldn't manage it, and neither could most people I know who tried. Again, computationally, it's very impressive.