How old was Kakashi when Namikaze Minato died? Did Tui die before Watergate? How did Lynn die? When did you die? After Watergate?

Kakashi 13 years old when Watergate died, because the Kyubi no Youko incident happened one year after the end of the third Ninja War.

Kakashi died with Tu 12 years old. This is the end of the third Ninja War. According to the comics 500 Sinatra and kakashi gaiden,

As for how and when Lin died, she didn't say that she must have died after taking the soil. Kakashi had joined the secret service at that time, and Lin was not with Kakashi. She may have died before Feng Bo.

And Kakashi's memory of Lin stays at 12- 13 years old, which means that according to Kakashi's memory of comic 425, Lin probably died at Kakashi's 12- 13 years old.