Death becomes her?? But in real life

I’m doing some research if you could help. Question 1 How Is living a long life (900+ years) like some of Seth’s descendants not a direct sign of divinity. I’m not super religious but the grouping I’ve been working with lately helped me come to this understanding “things that shouldn’t have happened aren’t deeply explained and aren’t harmful/negative I tend to take as a sign or divinity.” Just bc there’s already so much unknown when it comes to religion an unnatural GOOD thing I just take as divinity amongst earth. That leads me to my next question multiple descendants of Seth lived to be 900+ That’s a direct sign of divinity (to me and my grouping) so if anyone has any insight any scripture you could point me too of what lifestyle these people (descendants of Seth ppl who have lived 900+) Kept any scripture where their character is mentioned that allotted them SUCH a long life. & ultimately what could’ve happened to tarnish that family to the point Noah was the only pure blood and no one lives to be 900 anymore. I’m very open minded opinions welcomed this is less about religion as a whole more about living to be 900 how that was possible and could be possible again The Bible is interpreted a lot of ways so any feedback is welcomed Also I did see something about the calendar being different and some don’t believe they were actually that old.. saying it’s an exaggeration in writing