How old Am I? Answer twenty questions and see if your real age coincides with the age of your personality!
Aging or aging is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants, and some simple animals are potentially biologically immortal. In broader senses, aging can refer to single cells within an organism that have ceased dividing, or to the population of a species.
In humans, aging represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes. Reaction time, for example, may slow with age, while memories and general knowledge typically increase. Aging increases the risk of human diseases such as cancer, Alzheimer’s disease, diabetes, cardiovascular disease, stroke, and many more. Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes.
Current aging theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed aging concept, whereby the internal processes (epigenetic maintenance such as DNA methylation) inherently may cause aging. Programmed aging should not be confused with programmed cell death (apoptosis).
Obesity has been proposed to accelerate aging, whereas dietary calorie restriction in non-primate animals slows aging while maintaining good health and body functions. In primates (including humans), such life-extending effects remain uncertain.
Human beings and members of other species, especially animals, age and die. Fungi, too, can age. In contrast, many species can be considered potentially immortal: for example, bacteria fission to produce daughter cells, strawberry plants grow runners to produce clones of themselves, and animals in the genus Hydra have a regenerative ability by which they avoid dying of old age.
Early life forms on Earth, starting at least 3.7 billion years ago, were single-celled organisms (an organism that consists of a single cell, unlike a multicellular organism that consists of multiple cells). Such organisms (Prokaryotes, Protozoans, algae) multiply by fission into daughter cells(Daughter cells are cells that are the result of a single dividing parent cell. Two daughter cells are the result of the mitotic process while four cells are the result of the meiotic process. For organisms that reproduce via sexual reproduction, daughter cells result from meiosis); thus do not age and are potentially immortal under favorable conditions.
Aging and mortality of the individual organism became possible with the evolution of sexual reproduction, which occurred with the emergence of the fungal/animal kingdoms approximately a billion years ago, and the evolution of seed-producing plants 320 million years ago. The sexual organism could henceforth pass on some of its genetic material to produce new individuals and could itself become disposable concerning the survival of its species. This classic biological idea has however been perturbed recently by the discovery that the bacterium E. coli may split into distinguishable daughter cells, which opens the theoretical possibility of “age classes” among bacteria.
Even within humans and other mortal species, there are cells with the potential for immortality: cancer cells that have lost the ability to die when maintained in a cell culture such as the HeLa cell line, and specific stem cells such as germ cells (producing ova and spermatozoa). In artificial cloning, adult cells can be rejuvenated to embryonic status and then used to grow a new tissue or animal without aging. Normal human cells however die after about 50 cell divisions in laboratory culture (the Hayflick Limit, discovered by Leonard Hayflick in 1961).
At present, researchers are only just beginning to understand the biological basis of aging even in relatively simple and short-lived organisms such as yeast. Less still is known of mammalian aging, in part due to the much longer lives of even small mammals such as the mouse (around 3 years). A model organism for the study of aging is the nematode C. elegans. Thanks to its short lifespan of 2–3 weeks, our ability to easily perform genetic manipulations or suppress gene activity with RNA interference, or other factors. Most known mutations and RNA interference targets that extend lifespan were first discovered in C. elegans.
The factors proposed to influence biological aging fall into two main categories, programmed and damage-related. Programmed factors follow a biological timetable, perhaps one that might be a continuation of the one that regulates childhood growth and development. This regulation would depend on changes in gene expression that affect the systems responsible for maintenance, repair, and defense responses. Damage-related factors include internal and environmental assaults on living organisms that induce cumulative damage at various levels. A third, novel, concept is that aging is mediated by vicious cycles.
How Old Am I?
How old are you? How old am I is your personality? Answer twenty questions and see for yourself now.
How many questions are there?
There are 20 questions.
What can you get as a result?
Child at heart, Spontaneous teen, Thoughtful adult, Wise elder
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