[staytrue]

I haven't been able to figure out why creationists think ID supports a young earth interpretation.

It is because they think the Bible says so and therefore it is, QED.

and this is why ID is ridiculed by scientists.

[Steve_Seattle]

I'm not aware of any mainstream proponent of ID who argues for a young earth or a 6,000 year-old earth.

[Rudder]

...this is why ID is ridiculed by scientists.

You fall into the ignorant category...unless, of course, you're lying. If you read the article, then you would know what the objections raised by scientists are. You should inform yourself with accurate information about this debate.