The earlier generations lived longer. Adam lived to be 930. Noah was 600 when the Flood began in 1656. Abraham was born in 1948. The earlier generations were spread out more but as the later generations started to live shorter, their descendants outlived many of them. I think Noah died while Abraham was alive. Shem, Noah's son, is Malkitzedek, King of Salem (Jerusalem) in Parashat Lech Lecha.
Shem and his son Ever also ran a yeshiva in Tzvat were Jacob studied. Abraham died when Jacob was a teenager. That's when Jacob bought the birthright. The lentil soup was the food he was serving Isaac while he was sitting shiva since it is a mourner's food. That day Esav also killed Nimrod, the grandson of Noah. Esav also commited adultery and either theft or idolatry that day. I might be idolatry since those 3 are the 3 cardinal sins. I guess the adultery was that he raped a married woman.
Esav killed Nimrod to steal the garment of Adam. Nimrod took it from Noah. It was passed down. The same garment is also the "coat of many colors".