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From the minute we're born, we're aging.. Constant exposure to our environment, the things we eat, and stresses from both inside
and outside our bodies all cause us to age over time.
Aging is highly complex, but scientists are starting to understand what happens at the
cellular and molecular levels.. For example, healthy cells are damaged over time when our immune systems shift from reacting
to short-term problems like injuries and infections, to gradually producing chronic inflammation
throughout the body.. Time also gradually shortens the telomeres that act as protective caps for our DNA-containing
chromosomes.. These and other changes make our bodies less and less able to deal with stress from inside
and outside of our body, so when damage reaches a critical level, our cells, tissues, and
organs may no longer perform normally and our health starts to decline.
The changes associated with aging start to happen on some level at day one.
We begin to experience their effects early in life.
For example, we lose the ability to hear certain high-frequency sounds as teenagers, our cognition
and memory slowly decline after they peak in our mid-20s, the strength of our bones
starts to decrease in our 30s, female fertility sharply declines after 35, age-related near-sightedness
begins in our mid-40s, and our hair starts to gray and thin as early as our 30s and 40s.
After the age of 50, the changes of aging become increasingly noticeable, and because
/jəˈnediks/
study of heredity and variation of inherited characteristics. Studies of how things develop between generations.
/ˈsīəntəst/
person who is studying or has expert knowledge of one or more of natural or physical sciences. People who are trained in a science.
/əˈfekt/
change resulting from cause. Changes brought about by a cause; results. cause something to happen.
/ˈlərniNG/
acquisition of knowledge or skills through study. To get knowledge or skills by study or experience.
/CHānj/
act or process bringing change. Acts of making or becoming something else. To exchange one set of clothes for another.
/ˈaspekt/
part or feature. Elements, features, or qualities of something. form aspect with.