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development is age based matter
Growth and development of the brain (physical) lead to changes in mental abilities (intellectual) like reasoning, memory and relationships with people and objects. These abilities allow the child to make better personal and social adjustment (social).
Development is measured in qualitative terms for each stage of the lifespan there are developmental and milestones or developmental tasks and the achievement of these are seen to be recongnition of a particular stage.
What is measuring development
There are developmental expectations for every stage of life.
The HDI was created to emphasize that people and their capabilities should be the ultimate criteria for assessing the development of a country, not economic growth alone. The HDI can also be used to question national policy choices, asking how two countries with the same level of GNI per capita can end up with different human development outcomes. These contrasts can stimulate debate about government policy priorities. The Human Development Index (HDI) is a summary measure of average achievement in key dimensions of human development: a long and healthy life, being knowledgeable and have a decent standard of living. The HDI is the geometric mean of normalized indices for each of the three dimensions. The health dimension is assessed by life expectancy at birth component of the HDI is calculated using a minimum value of 20 years and maximum value of 85 years. The education component of the HDI is measured by mean of years of schooling for adults aged 25 years and expected years of schooling for children of school entering age. Mean years of schooling is estimated by UNESCO Institute for Statistics based on educational attainment data from censuses and surveys available in its database. Expected years of schooling estimates are based on enrolment by age at all levels of education. This indicator is produced by UNESCO Institute for Statistics. Expected years of schooling is capped at 18 years. The indicators are normalized using a minimum value of zero and maximum aspirational values of 15 and 18 years respectively. The two indices are combined into an education index using arithmetic mean. The standard of living dimension is measured by gross national income per capita. The goalpost for minimum income is $100 (PPP) and the maximum is $75,000 (PPP). The minimum value for GNI per capita, set at $100, is justified by the considerable amount of unmeasured subsistence and nonmarket production in economies close to the minimum that is not captured in the official data. The HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing GNI. The scores for the three HDI dimension indices are then aggregated into a composite index using geometric mean. Refer to Technical notes for more details. The HDI does not reflect on inequalities, poverty, human security, empowerment, etc. The HDRO offers the other composite indices as broader proxy on some of the key issues of human development, inequality, gender disparity and human poverty. A fuller picture of a country's level of human development requires analysis of other indicators and information presented in the statistical annex of the report.
WHAT ABOUT IN AN OLDER AGE DO THE BRAIN RETARD OR STILL FUNCTION AS NORMAL?
What is measuring development?
The average age at which particular characteristics of development are achieved is referred to as a milestone age. For each stage of the lifespan there are developmental milestones or developmental tasks, and the achievement of these are seen to be recognition of a particular stage of development. For example, it is expected that children will walk by the age of two and that adolescents will be seeking independence. There are social expectations that these milestones will be achieved at every stage of the lifespan.
For everyone in their life span, their development can me measured differently.
Health and Human Development - Measuring development
Development is measured in qualitative terms
The average age at which particular characteristics of development are
achieved is referred to as a milestone age.
For each stage of the lifespan there are developmental milestones or
developmental tasks,  and the achievement of these are seen to be
recognition of a particular stage of development.
For example, it is expected that children will walk by the age of two and
that adolescents will be seeking independence.
There are social expectations that these milestones will be achieved at
every stage of the lifespan.
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