I also don't believe Noha lived to be over 600 while everyone else in the book lived normal lifespans.
Below is a handy-dandy list of pre-flood characters in the Bible story of Genesis (which is of course based on older Mesopotamian texts).
Theses anomalous ages may potentially be accounted for by the explanation that these patriarchs were an advanced alien species which mated with humans. Odds are, it's all hooey. But it's possible, according to Dawkins, though he won't put a number on the exact odds or likelihood.
Patriarch Age Bible reference
1 Adam 930 Genesis 5:4
2 Seth 912 Genesis 5:8
3 Enosh 905 Genesis 5:11
4 Cainan 910 Genesis 5:14
5 Mahalalel 895 Genesis 5:17
6 Jared 962 Genesis 5:20
7 Enoch 365 (translated) Genesis 5:23
8 Methuselah 969 Genesis 5:27
9 Lamech 777 Genesis 5:31
10 Noah 950 Genesis 9:29
11 Shem 600 Genesis 11:10–11
12 Arphaxad 438 Genesis 11:12–13
13 Shelah 433 Genesis 11:14–15
14 Eber 464 Genesis 11:16–17
15 Peleg 239 Genesis 11:18–19
16 Reu 239 Genesis 11:20–21
17 Serug 230 Genesis 11:22–23
18 Nahor 148 Genesis 11:24–25
19 Terah 205 Genesis 11:32
20 Abram (Abraham) 175 Genesis 25:7
21 Isaac 180 Genesis 35:28–29
22 Jacob (Israel)
Table 1. Ages of the Patriarchs from Adam to Jacob