Meanings of age

Are there different ages?  Yes

1.  Chronological Age :   Age in years since birth.  It is a correlation between chronological age and different ages (eg.  child's motor development follows a sequence in the first two years).

2.  Functional Age:  How does a person function as compared to others of his/her age group?  Gerontologists refer to young-old who show patterns similar to younger age groups even though they are chronologically older. Old-old - who show patterns at or beyond their age group.

3.  Biological Age:  How far along the person has progressed along the life span.  Biological age is measured by examining vital organ systems.

4.  Psychological age:  refers to adaptive abilities in comparison.  Is person psychologically or on par with younger, or older than same-aged peers?

5.  Social Age: refers to behaviours that are similar to those displayed by one's chronological age group and that fulfill social roles and expectations that exist for that age group.  Does a 25 year old behave like other 25 year olds taking on the roles and responsibilities expected by society for 25 year olds?

6.  Mental age  -  Does one thinking and problem solving compare with those of his own chronological age group?  Is it above or below his/her chronological age group?  Binet introduced motion of mental age (MA) and Stern introduced the IQ formula.  MA/CA x 100 = IQ.