Djinn live to be thousands of years old. However, they age very little, so guessing the age of a djinn is near impossible.

Djinn are born with the ability to grant wishes for people. As such, you can cast the Grant a Wish cantrip.

Djinn get a +2 bonus to charisma, wisdom, and intelligence.

Djinn gain proficiency in deception, persuasion, and arcana.

Djinn get expertise in either arcana, deception, or persuasion.

Djinn speak common, primordial, and a language of your choice.

Djinn gain the ability to become wisps of cloud at will for faster travel. This gives them the ability to cast the Wind Walk spell once they become level 5, with the exception that they can only use it on themselves.

Djinn are excellent navigators due to their magical nature. They know the fastest way to get wherever it is they want to go. This gives them the ability to use the Find the Path spell for anywhere on the planet they are currently on once they reach level 8.