Aging Process

The study of aging, which is known as gerontology, (Non-restrictive) has particularly progressed (Present Perfect)in recent years. Scientists have been trying (Present Perf. Prog) to develop theories of aging for centuries, and neither of them has been accepted. There are two main categories of aging theories, such as programmed theories and damage theories. Programmed theories say that life expectancy is genetically (present passive)predestined. According to the Hayflick Limit Theory, humans cells stop functioning and then die ( participial phrase) after dividing about fifty to sixty times. Damage theories say that damage to our cells is responsible for aging. Cells accumulate free radicals that can damage parts of our cells such as proteins and DNA. Nowadays, aging is being concerned (Present Prog.Passive) by many of us because we want to look good and live healthy. Today, people are looking for different ways to prevent aging. Many of us are trying to figure out what causes aging, so we are doing everything for that. For example, here in the United States, Americans spend (present) millions on anti-aging therapies, diet products and anti-aging products like serums, gels, powders and creams that are all promising to be the fountain of youth. We make right choices about food we eat, try to avoid stress, exercise and change our life for the better.

According (single word participle) to the lecture I am going to share some information about the oldest person in the world who (relative clause) was 256 years old. In 1933, in the blogs of Time Magazine and The New York Times reported (past) that at the age of 256 died Li Ching Yuen, who by this time had already buried (past perfect) 23 wives and educated 180 heirs. The secret of youth of Li Ching Yuen consisted in the fact that he always kept the peace of mind; herewith, his diet consisted of rice and wine. It