I am 57, so no. NAS overrated ? You are really killing your credibility here. Ice T, Busta Rymes, Dre (the rapper not producer), and several more on your list couldn't hold Kendrick's jock strap. Eric B was not lyrical (DJ), that would be Rakim. Throw in some Soulja Boy, Diddy and Rick Ross and your list would be ALMOST complete. Beastie Boys ? LOL.
Along with Kendrick Lamar, after the top 5, not any particular order :
Tupac
Jay Z
Biggie
Eminem
NAS
Lil Wayne
Kayne West
LL Cool J
And this is coming from someone who loved NWA, Beastie Boys, and listened to a lot of 50. I put a lot of your rankings in line with rappers like Jeezy, Too Short, J Cole, Future, Run DMC among many others, all good rappers, had very popular songs, just not elite. Doesn't mean they are bad, just a few rungs below elite guys.
Music is subjective. I assume rap is, as well.