Yes you Can do b. Tech at the age of 24..

You have to fulfill the eligibility criteria for the admission . The criteria is given below.

Age is no bar for attaining knowledge if you have the zeal to study. The eligibility criteria for B. Tech Mechanical Engineering at LPU is: Pass with 60% aggregate marks in Diploma (Engg.) ... (Computer Science) or equivalent.So, if you have 60% and above in diploma, you can very well take admission into B.tech

Hope it's helpful for you.

Thank you