Which of these men lived the longest?

Answer: Methuselah

Genesis gives Methuselah 969 years, longer than Adam (930), Noah (950) or Abraham (175).

“So Adam lived a total of 930 years, and then he died. So Methuselah lived a total of 969 years, and then he died. So Noah lived a total of 950 years, and then he died. Abraham lived a total of 175 years.”— Genesis 5:5, 5:27, 9:29, 25:7 (BSB)