Hello there! 

Greetings! 

Yes , of course you can use your class 10th marksheet as a proof of date of birth as 10th Marks Sheet  is accepted as Date of Birth. 

Thankyou 

Good luck 

Hi,
Class 10's marksheet is not treated as an age proof though the admit card of 10th boards where they mention your birth date might be applicable in some places. Mainly you need to show birth certificate, voter id card, aadhar card, driving license, passport or any other official government document that are generally accepted as age proof.