June 10, 2008 : There are three factors important for life span. Here one is considered most important both medically and otherwise.Most of the substance of our body really doesn’t continue to get older during our life: a great many of our body’s parts are constantly repairing and replacing themselves.

The epidermal cells that cover the entire surface of our skin, for example, never get older than one month.

New cells are continually produced (by cell division) deep in the epidermis, while the older ones continually slough off at the surface.

Similarly, the cells lining our intestines completely replace themselves every four days; our red blood cells are entirely replaced about every 90 days; and our white blood cells are replaced about every week.

Even cells that never (or rarely) divide, such as cardiac muscle cells and brain cells, turn over molecule by molecule. It is believed that little or nothing in our body is more than about 10 years old.

Thus, thanks to cell turnover and replacement, most of the organs in the body of a 90-year-old man are perhaps no older than those of a child. Indeed, you might say our body never actually grows older.

It’s rather like the story about “grandpa’s ax.” It seems a man had an old ax that hung over his fireplace and which he claimed had been passed down in his family for five generations.

When asked how old the ax was, he said he wasn’t sure because although his great-great-great-great grandfather bought the ax about 300 years ago, he also understood that over the years, the ax had 6 new heads and 12 new handles.
Our bodies are something like grandpa’s ax in that we too are constantly replacing “heads and handles,” and in a sense we never get older.

At this point we might be inclined to ask, why did Methuselah die so young? How, indeed, is it even possible for anyone to age and die if the body constantly repairs and replaces its parts?

Surely, if our automobile could do this, we would expect it to last forever. Part of the answer may be that certain key parts of our body fail to repair or replace themselves.

Our critically important heart muscle cells, for example, fail to multiply, repair, or replace themselves after birth (al- though, like all muscle cells, they can increase in size).

This is why any disruption in the blood supply to the heart muscle during a heart attack leads to permanent death of that part of the heart. The nerve cells of our brain—including those of our eye and inner ear—also fail to multiply or repair themselves.

From the time of our birth to the end of our life, we lose thousands of nerve cells a minute from our central nervous system, and we can never replace them. As we get older, this causes a progressive loss of our ability to hear, see, smell, taste, and . . . ahh . . . something else, but I just can’t remember it!

The important point is that science offers no hope for eternal life, or even for the significant lengthening of life.

It has been estimated that if complete cures, or preventions, were found for the three major killers (cancer, stroke, and coronary artery disease), the maximum life span of man would still not increase (although more people would approach this maximum). And such long-lived people would still become progressively weaker with age, as critical components of their body continue to deteriorate.

Where is the right answer of life and death, only spiritualism can guide, each religion has certain directions to eternal life, may be any religion, it may be even Christianity, try to search.
More