Perforation is more likely in younger kids because:
1. More thin walled appendix, predisposing to early perforation
2. Younger children can’t communicate as well, resulting in prolonged symptoms before diagnosis
3. The level of suspicion for appendicitis is lower in younger age groups
Pro-Tip: In addition, appendicitis can progress to peritonitis quicker in infants, because they have a less well developed omentum, and thus cannot contain infection as well.