Who is most vunerable to dehydration?

The most vulnerable groups to dehydration include young children, the elderly, and individuals with chronic illnesses. Young children have higher fluid needs relative to their body size and may not recognize their thirst. The elderly often have diminished thirst sensations and may also have health conditions that affect hydration. Additionally, people engaging in intense physical activity or those in hot climates are at increased risk as they lose fluids more rapidly.