It's important to note that these sources are giving you the suggested belt change intervals. No cam belt is warranted to reach 10 years/100,000 miles. And even if it was, the warranty wouldn't pay for a replacement engine if the water pump or pulley failed (two things that should be replaced at the same time as the cam belt).

Most cam belt failures (we hear about) occur after 60,000 miles and/or five years. That's why we suggest getting the belt changed before either of these intervals come into play.