Hi Harish.

It is strongly recommended to use one picture only for Hall Ticket as well as other forms. If you have a picture of your younger self and you are easily recognizable then it can be used. However, if the picture is of too younger self like 12-14 then it might create an issue with authorities who check hall ticket and aadhar card. You can stick a recent photo in application form but at time of examination make sure to carry both of these photos, to avoid any inconvenience because we can never know what type of people in authority you will get to meet.

Good Luck