Effective, even with health, will still make you more vulnerable against thermal shock or heat depletion. These changes determine three basic factors.
Less effective blood circulation. As age, changes in the heart and blood vessels contribute to the worse circulation of blood. Therefore, it becomes difficult to control the body temperature.
Decrease in the body’s sweating ability. The skin is thinner with age, because the ducts of the sweat glands approach the surface of the skin. At the same time, you lose the collagen required to create connective tissue.
Higher sensitivity to dehydration. One study has shown that glomerular filtration rate (kidney work) may begin to decrease in 40 years. In addition, the elderly accepts diuretics or soothers that often cause dehydration or affect the body’s sweating ability.
In addition, older people are more prone to the development of chronic diseases that can aggravate them at severe temperature.
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Source: Ferra

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