WellCookedFetus, Even if it is so, we can easily treat it & get the age increased. If we can know the reson/cause then furthur task can be easy. Is it not ok? Please Register or Log in to view the hidden image!
Raise stomach pH and you might increase your risk of ulcers and lethal stomach bleeding. At that age you stomach walls are paper-thin.
Is it after effect of aging? If we take care previously then? However if ' tollerance effected' is something common on aging?
Right. There is a tradeoff somewhere along the line and it seems to be about 80 years for homo sapiens. After the age of 80, the cost of keeping the body maintained outweighs any potential genetic benefits from more offspring even if we could reproduce into old age. Do u agree with this Fetus?
I would say the trade of is lower then that, our bodies degenerate after I primes in are early 20's. Evolution did not see a need for us to live in optimum condition past this, extended survival is do to modern science keeping people alive longer, it would take evolution a long time tie increase human life span based of are present trend of living longer and having children at older ages, even so I think that part of the reason why we live longer the many other mammals, we are a social species and older members are still helpful.
OK but do u think the theory is essentially right? It is a trade off between the cost of maintenance and benefit of offspring?
Yes of course, we live longer then most mammals because we can benefit are young longer, but we still grow old and die.
actually i think it can. hope i didn't give the impression that it can't fruit fly artificial selection experiments have extended fruit fly life spans significantly problem with mammals is the determinant number of eggs a female has, they obviously will run out at some time.
this is not true. delayed reproductive age is sometimes selectively advantageous. it depends on an organism's ecology, life history characterisitcs, etc. reproductive age has great variability, there is NO evidence that there is directional selective force decreasing age at first reproduction. there are some organisms that are born pregnant, and i think some cetacean species where age of first reproduction is in the 30's or 40's
paulsamuel, Note the use of "usually" and "rarely", my statements are not all encompassing, there are vast exceptions.
actually the theory's implication is the differential reproductive selective value of being young vs. being old
http://www.merck.com/mrkshared/mm_geriatrics/sec13/ch102.jsp "Although aging has no significant effect on secretion of acid and pepsin by the stomach" The effect is caused by disease, A follows B doesn't mean A caused B. Basic logic Kumar, that you DO know about.
PJ, Our created early Aging in itself is like a disease. More mental stresses on aging are common. Mental stresses can effect stomach acidity.