If he had a kid when he was 17, and then his kid had a kid when they were 17, that would make him a 34 year old grandfather. It's not even that tight of a metric. Like 17 isn't even a super young age for accidental pregnancies. Hell, if he had a kid at 15, then that kid could have had a kid when they were 19, already an adult and graduated, and had him still be a grandfather. It's not that absurd to have grandkids at 34 if you and your kid were both very young
Connect the dots? Sticks and holes Tinker toys? Sticks and holes Linked up, baby elephant walk? Trunk to tail How they come up with this is beyond me, but it's so friggin hilarious!!