Annual estimates of the population in the age group 65+ in a certain city from 1999 (t = 1) onward are used to estimate the following quadratic trend model: 
Using this model, the estimate for 2008 is
Definitions:
Thyroid Hormone
Hormones produced by the thyroid gland, primarily triiodothyronine (T3) and thyroxine (T4), which regulate metabolism, energy generation, and neuronal development.
Aldosterone
A hormone produced by the adrenal glands that helps regulate the balance of salt and water in the body.
Cortisol
A steroid hormone produced by the adrenal glands, involved in the body's response to stress, metabolism, and immune system regulation.
Growth Hormone
A peptide hormone that stimulates growth, cell reproduction, and cell regeneration in humans and other animals.
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