Dear Deenesh, you will be eligible for the army soldier technical on/after 24-09-2019. As per the guidelines the age for recruitment into Indian Army for Soldier Technical category is between 17 ½ to 23 years of age.

So, till now you didn't meet this eligibility criteria. 

You can check the official site for further information -

https://www.google.com/url?sa=t&source=web&rct=j&url=https://kikali.in/soldier-technical-selection-procedure-eligibility-sol-tech/amp/&ved=2ahUKEwiD2b6XndXjAhVJs48KHfl-C3gQFjAEegQIAhAB&usg=AOvVaw3NE-9GhVsXWJ5pdTrcw-Ng&ampcf=1

All the best 

Hope this helps