World's oldest woman / man

[Thrifty]

Whenever I think about people with record longevity (as in, over 110 years old), I think about how, the generations if that person had a kid at a fairly young but not teen age (I put the age at 23) and then that kid did the same, and so on and so on. How many greats separate the youngest (a mere child) from this elderly person? I can never really remember, so I'm always doing the math again. I guess it goes something like this, with a 116 year old man named Bob.

Bob, age 116
Bob Jr., age 93
Bob III, age 70
Bob IV, age 47
Bob V, age 24
Bob VI, age 1

So Bob is extremely old and can barely see his great-great-great grandson. It's tight, but I guess this is about as many generations you can fit into one human lifespan. Though I guess it's in the realm of possibility, I've never heard of anyone referring to their great-great-great grandchildren. I've read some obituaries that referred to a great-great grandchild, and that staggered my mind.

I get fascinated by prospects such as being an adult with a living great-great grandfather. Or being very old but still having a living father. Or being merely kinda old and visiting your grandfather. Or being middle aged and having a great-grandfather.