Age logic

Was rewatching mjht and have a doubt.what is the age of all characters? The reason y i got this doubt was in season 2 , there was a scene where gunjan says to Mayank that dhruv got released after 5 years and dhruv too says that he was searching for nupur for 3 years. Gunjan also said that their father sent nupur n her to mumbai because of him.

So the question is exactly how old r nupur, dhruv n gunjan. N hw cme he was searching for 3 years when nupur has only 1 year in college ?? 😕