If a snake can live for up to 40 years, depending on the species, where are all the senior snakes?

I see photos of a lot of babies and yearlings, some that are a little older, but not many that are very old at all.

What is/are the oldest snake(s) you own, and how long have you owned it/them?

And of course... if you have pics, please post them! I love seeing pics!