Given that his superspeciality medical studies alone wld taken him well into his 20s and he has become an established / top surgeon, Dr Rohit has to be nudging 35 at least. The cvs wld be ruining their own premise of presenting the medical field realistically if they showed him any younger.
As for Sonakshi it appears she has been a struggler & established herself, plus she has a past affair so she wld be arnd 30 at least. If her brother is doing mbbs he must be between 18-23 plus there is the brat sister above him in her twenties so Sona nudging 30 wld be appropriate. Her mature character also matches that I think she does look arnd 35 so not too much off the mark.
What do u all think?