Although those are very true, I think the makers of Naruto forgot about the age factor. The ages don't really make sense if you think about it. I'll use an estimated age for these people.

1st+2nd->3rd (about 10 when he became Hokage)
3rd (about 40 at this time)->Oro, Jiraiya, Tsunade (about 9 or 10 at this time)
Oro (about 30 this time)->Anko (maybe 11)
Jiraiya (40 this time, which makes 3rd 70)->4th (about 15 in the picture)
Jiraiya (50 now, 3rd 80)->Naruto(12, born same time 4th died)

Now think about it, the 3rd IS NOT 80 YEARS OLD, because his grandson is only like 7 or 8!!

btw, I know Jaraiya and Oro's age because they're the same as Tsunade, and she's 50