New characters ages

Before leap Punni and Ruchi were almost 4/5 yrs old. Same with Sachin. Arjun, Teju, Ovi were infants...so after 18 yrs only Arjun, Teju and Ovi will be around 18 yrs. Punni is suppose to be 23 /24 yrs old. So logically she is 4-5 yrs older than Arjun!!! I am not sure how old was Purvi when she was adopted. Again...at the age of 18 yrs Arjun is not doing any college but taking care of family business...wow!!! Rich people do not need to attend college!!! I am assuming that Teju and Ovi are in college and Teju is in India in her vacation!!!