Read Genesis Chapter 5 today in the ESV study Bible had a few observations.
First it goes over genealogy from Adam to Noah with the exception of one(Enoch) it says "and he died." Meaning most likely none of us are getting out of the life alive.
Enoch is the one that walked with God, yet compared to all the others on the list his life on earth was much shorter. I also noticed he lived he same amount of years as days in a year; 365. Not sure if that's significant.
Lameh who fathered Noah who was going to be part of cleaning of the earth lived 777 years. I find that interesting because it's said 666 is the mark of the beast but 7 is a godly number.
Final observation for this chapter is the fact that their lives are measured and split from when they fathered a child. Having a child is an amazing gift from God but it does really change how you live your life. At least it should.