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Adult development encompasses the changes that occur in biological and psychological domains of human life from the end of adolescence until the end of one's life. Changes occur at the cellular level and are partially explained by biological theories of adult development and aging. [ 1 ]
Emerging adults "regard themselves as being neither adolescents nor adults, in between the two but not really one or the other." [2] [22] This feels like an awkward time of life as these emerging adults have control and independence, yet they may still be relying on their parent's insurance, housing, and groceries. They are able to do many ...
In humans, adulthood is thought to be around 20 or 21 years old and is the longest stage of life, but in all species it ends with death. [33] In dogs , small breeds (e.g., Yorkshire Terrier , Chihuahua , Cocker Spaniel , etc.) physically mature faster than large breeds (e.g., Saint Bernard , Great Dane , Golden Retriever , etc.), so adulthood ...
Axolotl and olm are perennibranchiate salamander species which retain their juvenile aquatic form throughout adulthood, examples of full neoteny. Gills are a common juvenile characteristic in amphibians which are kept after maturation; examples are the tiger salamander and rough-skinned newt, both of which retain gills into adulthood. [33]
In biological terms, human development entails growth from a one-celled zygote to an adult human being. Fertilization occurs when the sperm cell successfully enters and fuses with an egg cell . [2] The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences.
The word, youth, can also mean the time between childhood and adulthood , but it can also refer to one's peak, in terms of health or the period of life known as being a young adult. [ 1 ] [ 2 ] Youth is also defined as "the appearance, freshness, vigor, spirit, etc., characteristic of one, who is young". [ 3 ]
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Positive adult development is a subfield of developmental psychology that studies positive development during adulthood. It is one of four major forms of adult developmental study that can be identified, according to Michael Commons ; the other three forms are directionless change, stasis, and decline. [ 1 ]