The index age that represents a persons intellectual memory or learning ability function is called psychological age.
Psychological age is determined by one's feelings, actions, and behaviour; it is not always the same as chronological age, which is the number of years since birth. Therefore, if a person is mature or even just feels older than they are, they may have a psychological age that is greater than their actual age.
The development of psychological theories of intelligence has progressed largely independently of biological advances and is focused on "goal-directed adaptive behaviour" that has sociocultural meaning.
"Learning abilities" are whatever it is that governs how quickly and adaptably we pick up and can use new information and skills.
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