hello, 

As per Supreme court there is no age bar in applying to law courses in india. so as per your age which is 21 approximately you are definitely eligible to apply for law courses. but you need to take care of other criterias.

• you need to possess at least 55% if you belong to general category in bachelors to take admission in LLM, while 50% is for reserved category
• the institution you are pursuing bachelors in must be approved by bar council of India.

to know about full eligibilty criteria for CLAT you can visit https://law.careers360.com/articles/clat-eligibility-criteria

to know the eligibility criteria of other universities you need to visit their official websites:-

• AMU www.amu.ac.in
• Jamia MILLIA islamia, new Delhi www.jmi.ac.in
• BHU www.bhu.ac.in

thanks.