Equivalence Class/Examples/People of Same Age

Example of Equivalence Relation
Let $P$ be the set of people.

Let $\sim$ be the relation on $P$ defined as:
 * $\forall \tuple {x, y} \in P \times P: x \sim y \iff \text { the age of $x$ and $y$ on their last birthdays was the same}$

Then the equivalence class of $x \in P$ is:
 * $\eqclass x \sim = \set {\text {All people the same age as $x$ on their last birthday} }$