Yea I used to hear 150 but I think 100 is at the higher end of their life span. They grow faster the more they eat so he could be half the size or twice the size and still be around the same age. I think the oldest verified ones make it to about 80 or so but that's no reason to think it couldn't be longer. Average human life expectancy varies from 60-70 usually and there are plenty of people over 100 so why not crocs too :)