From what science say breathing make carbon monoxide tree filter the air to remove that carbon monoxide. it could be that the environment in the beginning was more sane for the physical body. since none of use was there at that time physically to tell if those years of life time of the physical body are true, you cannot have a definitive answer.

What you can do is look at the environment around you and how it changes over time. pollution, industrial waste affecting the air and water, war, nuclear missile, chemical and bacterial weapon. man changing the food they eat like crop genetically modify to poison bugs, that you are eating, not knowing what effect it as on you.

Could this change the amount of time that your physical body will live?

if you answer yes there is a good chance or high probability that people lived longer before.

There was also science news 15 year ago telling that if they modify some gene in the human body people could live up to 500 year the only problem is that people physical metabolism will be much slower, if you look at it people have issue with stress always the need to go faster and faster to make more money.

The Stress Epidemic Stress is epidemic in the western world. Over two-thirds of office visits to physicians are for stress related illness. Stress is a major contributing factor either directly or indirectly, to coronary artery disease, cancer, respiratory disorders, accidental injuries, cirrhosis of the liver and suicide; the six leading causes of death in the United States. Stress aggravates other conditions such as multiple sclerosis, diabetes, herpes, mental illness, alcoholism, drug abuse, and family discord and violence. The stress epidemic is an extremely costly one. The medical costs alone have been estimated in the United States at well over 1 Billion dollars per year. Stress costs industry approximately 150 billion dollars per year in increased health insurance outlays, burnout, absenteeism, reduced productivity, costly mistakes in the office and on the shop floor, poor morale, high employee turnover, as well as family, alcohol and drug related problems.

Stress: The Silent Killer Stress is a state of tension that is created when a person responds to the demands and pressures that come from work, family and other external sources, as well as those that are internally generated from self imposed demands, obligations and self-criticism. Stress is both additive and cumulative. It adds up over time until a state of crisis is reached and symptoms appear. These symptoms may manifest themselves psychologically as irritability, anxiety, impaired concentration, mental confusion, poor judgment, frustration and anger. They may appear as physical symptoms. Common physical symptoms of stress include: muscle tension, headaches, low back pain, insomnia and high blood pressure. Untreated, these symptoms may lead to physical illness and sometimes death.

http://www.stressfree.com/stress.html

Could it be that people in the past add less stress, and less environment issue.

So you can meditate on this and come up with your own answer.

Once done you can make the proper change for your self.

The question is would you want to live to 930 years old in the environment of today knowing that your body will fail, that even if you could force your self on the inside to stay in the body and repair the damage as long as you can, Do you really want that?

Will also let you meditate on this one.

use the time imparted to you wisely, why do you seek the end? For where the beginning is, there will the end be. Blessed is he who shall stand at the beginning, and he shall know the end, and shall not taste death.

Let there be light, be the light that you can be, experience and enjoy.

your mind, soul, will have their own
separate space within your
body, which physically
began dying at birth

you have ground work to do

I tell you what:

Live with parents that use you like a slave; then marry someone who clearly thinks of you as a maid, sexual toy, and leaves the kid-rearing to you.... I guarantee you, it will feel like 900 years- that is, if you only focus on the negative, take your unhappiness out on everybody around you, and so on...but

Move on, marry a great guy who can make something positive out of just about anything.... and you will wish you could live for 900 years.

There have been certain people down through history who, using their gifts to the absolute fullest capacity of their hearts, have lived on long after their bodies were dust. Take Beethoven as an example. I truly think his music will be heard on spaceships from Earth, flying across the cosmos. We have been blessed down through history to have had such people live among us for a time. Mozart was in his early thirties when he died... And his music, too, will live on and on. Stingray mentioned Plato's Republic. There is another good example. We are still reading his words...

So, I believe if you want to live on and on, use your gifts. Be nice, too. Pass it forward, as they say. And you will leave behind you maybe not your body, but your spirit.

Happy day.

Jaianniah