Because they have either respectively not yet developed sufficient immunity, or may have weakened immunity.
If you mean will the injection of a flu shot/jab hurt, then no more than any injection, but it might hurt a little just for a short time during the injection. If you mean will the vaccine be dangerous for a ten year old, it has been proven to be one of the safest vaccines even for infants and the elderly over decades of use.
Instead of killing mostly infants and elderly, it had little effect on them and killed mostly young adults. A group rarely significantly affected by flu. It also caused significant neurological problems in some survivors, which is also rare for flu.
Infants and the elderly
The flu vaccine is recommended for children and the elderly but nobody is forced to get it. Whether or not to get a flu vaccine is a personal choice.
Children and the elderly.
babies, infants and the elderly
At times the chickens are dangerous to humans. They can give you bird flu. Bird flu can be lethal.
Hypernatremia is especially dangerous for children and the elderly
Infants and the elderly, because their immune systems are weak.
Homeless people can be any and every age, from infants to the elderly.
Infants and elderly individuals have compromised thermoregulation mechanisms, making them more susceptible to temperature changes. Infants have higher body surface area to body weight ratio, leading to faster heat loss. Elderly individuals might have decreased ability to regulate body temperature due to age-related physiological changes and chronic health conditions.
because an elderly person has weaker bones.