The aging of people is accompanied by the dehydration of the entire organism - "old" people contain only 50% of the water of the "young" organism, and therefore also the decline in energy potential. Perhaps a better definition would be that the dehydration of the entire organism, and therefore the decline in energy potential, is the cause of people's aging. The dilemma exists, it is understandable, and therefore I will put the term age and youth under quotation marks.
The answer to this question may be covered in a change of regulation of secretion antidiuretic hormone (ADH) to "age", and is subject to the physical laws of osmosis: the increased concentration of the extracellular fluid causes the fluid by osmosis exits the osmoreceptor cell, due to which they will be reduced, and in the hypothalamus resulting nerve signals causing additional secretion of ADH . Conversely, if the extracellular fluid becomes too diluted, water osmosis enters the cells, and this reduces the stimulus for the secretion of ADH.
The role of ADH in the central nervous system (CNS) is associated with daily rhythms, aggression, regulation of blood pressure, temperature regulation and memory processes, and acting on the kidney and arterioles causes arteriole constriction and water saving by concentrating and decreasing the urine volume, which is achieved.by increasing water reabsorption in distal canals and nephron collection tubes. The secretions of the secretion are the decrease in the volume of blood plasma and the increase in its osmolality.
In addition to the above fact, water is unpredictable in its behavior and that the way in which it restructured its molecules, and today, for many, a great "mystery". It is possible that in "age" it comes to people who are quicker to become disturbed in its restructuring.
Correction: In the text of the question in row 7 from below, instead of "The secretions of the secretion ..." should be "Stimuli for secretion ...". Please note this correction!
One accepted view is that dehydration occurs because the center for noticing that one is thirsty is not working properly in aging. Many old people do not care on taking water and you need to give them water or flavoured gels. On doing so dehydration is not occurring or does not seem a relevant lifethreatening factor.
In the absence of any specific illness and in my surroundings I never see that dehydration is a factor if corrected by caregivers or in Hospitals/Institutions for old people. For instance, the weight of the individual that is dying or when he/she dies is similar or even higher than when younger (in "Normal" death not in cancer-, etc-derived deaths)
Thank you, dear Raphael, with an interesting and reasoned answer.
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