"You know, there's chronological age, there's biological age, and there's psychological age. Chronological age, there's nothing you can do about, which is I'm 52. You set that number aside"

Cheryl Tiegs is recommending that age is not simply a number. She is describing the three different kinds of age: sequential age, biological age, and psychological age. Sequential age is the number of years a person has actually been alive, and it is something that can not be changed. Biological age is the age of a person's body, which can be impacted by way of life choices. Mental age is the age of a person's mind, which can be affected by life experiences. Tiegs is suggesting that sequential age ought to be reserved, and that the other 2 kinds of age must be considered when evaluating an individual's age. She is emphasizing that age is not simply a number, and that it is important to take a look at the entire individual when thinking about age.