So much misinformation has been written above.
1. Mesushelech was born prior to the gezeirah mentioned in the passuk ans was probably well passed 120 years old at the time of the “nefillim”.
2. Almost all the direct descendants of Noach that make up the 10 generations between him and Avrahom lived more than 120 years.
3. The avos lived >120 years.
4. Yosef was the first of the shevatim to die and he was 110 years old. Levi lived the longest to 137 years. Levi was approximately 114 when Yosef died so all of the other shevatim were around 120.
5. LU wrote: “Also, Serach lived longer than 120 and she was after Moshe Rabeinu.” I take that as “she lived longer than 120 and she died after Moshe Rabeinu”.