Find the Difference Age Between x, y And X ?

Let X be that set of all citizens of India. Elements x, y in X are said to be related if the difference of their age is 5 years.

Which one of the following is correct ?

1. The relation is an equivalence relation on X.
2. The relation is symmetric but neither reflexive nor transitive.
3. The relation is reflexive but neither symmetric nor transitive .
4. None of the above .