Why Can't People Live For Over 900 Years of Age Now?

The Bible teaches quite plainly that the early patriarchs often lived to be nearly 1,000 years old and even had children when they were several hundred years old! “Methuseleh lived 900 years but these stories you’re liable to read in the Bible, they ain’t necessarily so.”1

Along with American composer George Gershwin, many people find it difficult to believe that Methuselah lived to be 969 years old. Nevertheless, the Bible teaches quite plainly that the early patriarchs often lived to be nearly 1,000 years old and even had children when they were several hundred years old! Similar claims of long life spans are found in the secular literature of several ancient cultures (including the Babylonians, Greeks, Romans, Indians, and Chinese). But even a life span of nearly 1,000 years is sadly abbreviated when we consider that God initially created us to live forever.

For 1,500 years after creation, men lived such long lives that most were either contemporaries of the first man, Adam, or personally knew someone who was! The ten patriarchs (excluding Enoch) who preceded the Great Flood lived an average of 912 years. Lamech died the youngest at the age of 777, and Methuselah lived to be the oldest at 969.

Table 1. Ages of the Patriarchs from Adam to Noah

	Patriarch	Age	Bible Reference
1	Adam	930	Genesis 5:4
2	Seth	912	Genesis 5:8
3	Enosh	905	Genesis 5:11
4	Cainan	910	Genesis 5:14
5	Mahalalel	895	Genesis 5:17
6	Jared	962	Genesis 5:20
7	Enoch	365 (translated)	Genesis 5:23
8	Methuselah	969	Genesis 5:27
9	Lamech	777	Genesis 5:31
10	Noah	950	Genesis 9:29

During the 1,000 years following the Flood, however, the Bible records a progressive decline in the life span of the patriarchs, from Noah who lived to be 950 years old until Abraham at 175 (see figure 1 and table 2). In fact, Moses was unusually old for his time (120 years) because, when he reflected on the brevity of life, he said: “The days of our lives are seventy years; and if by reason of strength they are eighty years, yet their boast is only labor and sorrow; for it is soon cut off, and we fly away” (Psalm 90:10).

Table 2. Ages of the Patriarchs after Noah to Abraham

	Patriarch	Age	Bible Reference
11	Shem	600	Genesis 11:10–11
12	Arphaxad	438	Genesis 11:12–13
13	Shelah	433	Genesis 11:14–15
14	Eber	464	Genesis 11:16–17
15	Peleg	239	Genesis 11:18–19
16	Reu	239	Genesis 11:20–21
17	Serug	230	Genesis 11:22–23
18	Nahor	148	Genesis 11:24–25
19	Terah	205	Genesis 11:32
20	Abraham	175	Genesis 25:7

Extrabiblical evidence to support the long life spans of the people in Genesis is found in the Sumerian King List. This list mentions a flood and gives the length of the reigns of kings before and after a flood.

Today, man’s maximum life span is about 120 years, and our average life expectancy is still only 70–80 years—just as it was when the 90th Psalm was written 3,400 years ago! The precipitous plunge in life spans after the Flood suggests that something changed at the time of the Flood, or shortly thereafter, that was responsible for this decline. A line graph of this decline reveals an exponential curve.

Biological Causes of Aging

What exactly causes this process of aging in our body? Although the mechanism of aging (and its prevention) has long been an object of biomedical research, science still has no definitive answer to this question. Around the turn of the century, it was believed that aging didn’t directly involve the living cells of our body but rather was an extracellular phenomenon. It was believed that our normal living cells, if properly nourished, could grow and divide indefinitely outside our body. In 1961, this idea was refuted by Leonard Hayflick, who grew human cells outside the body in covered glass dishes containing the necessary nutrients. Hayflick discovered that cells cultured in this way normally died after about 50 cell divisions (Hayflick’s limit). This suggests that even the individual cells of our body are mortal, apart from any other bodily influence.

Genetic Determinants

Both aging and life span are processes that have genetic determinants that are overlapping and unique. Approximately 20–30 percent of factors affecting life span are thought to be heritable and thus genetic. Life span varies greatly among individuals, indicating that while aging plays a role, other factors are also involved. Telomeres, which are long, repetitive sequences of DNA at the ends of human chromosomes, are also thought to play an important role in aging. With each division of the cell, telomeres shorten due to the inability of the enzyme that copies the DNA to go all the way to the end of the chromosome. When telomeres have become too short, the cell stops dividing. This limitation plausibly serves as a quality control mechanism. Older cells will have accumulated many mutations in their DNA, and their continued division may lead to diseases like cancer. Most body cells cannot replicate indefinitely, leading to aging and eventually death. Thus, telomeres are important in determining the life span of cell types that directly affect aging.

Physiological Determinants

In one sense, 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 4 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.

Is it even possible for anyone to age and die if the body constantly repairs and replaces its parts? 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 (although, 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 and even remember things?

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.

Adapted from: Did People Like Adam and Noah Really Live Over 900 Years of Age? by Dr. Georgia Purdom and Dr. David Menton on May 27, 2010

1. George Gershwin, “It Ain't Necessarily So,” Porgy & Bess, 1934.