Subjective Age

The term "subjective age" is primarily the wheelhouse of psychologists, as it typically refers to how old one perceives oneself to be.

Thus, if you're 75 but think of yourself, in your mind's eye, as 45, that can influence the way you cognate, behave, self-identify, and even what reference groups and tribes you associate with.

It also sometimes overlaps with the worlds of biology and fitness, though, as some research has suggested that folks with older subjective ages tend to be more frail, and that this frailty is associated with other health-related elements, like strength, balance, cardiovascular health, and so on.