How about Mesushelach? Or for that matter – Eliyahu Hanavi and Serach.
Also, I think it is brought down that Chira who helped Shlomo build the Beis hamikdash was the same Chira who was a friend of Shlomo’s ancestor Yehuda.
The passuk in Tehillim says 70-80 years. The mishna is Pirkei Avos lists 90 as already very old.
People have lived longer than 120 though most “normal, healthy” people nowadays don’t make it to 100.
I’m not sure where the idea that 120 is the ideal comes from but it seems to be the mesora. I assume it has something to do with Moshe Rabeinu. Either way, a bracha even from a hedyot is not to be taken lightly so when you hear somebody say “ad meah v’esrim” you should answer Amen and have kavana that the bracha should be chal. Also, when giving this bracha to someone you should have in mind that they should not only live to 120, but also have the strength that Moshe Rabbeinu had.