Age

1. Dennis is older than Polly, but he is younger than Rick.

2. Polly is the youngest of the three, and Rick is the oldest.

Height

3. Rick is shorter than Dennis, but he's taller than Polly.

4. Dennis is the tallest of the three, and Polly is the shortest.

Hair

5. Polly's hair is longer than Rick's, but shorter than Dennis'.

6. Dennis' hair is the longest of the three, and Rick's is the shortest.