Llb course at the age of 50 where no clat is required

You can check for that through internet or in any government law college websites.

Age is not concerned with the course of studies.

CLAT is applicable to all students seeking admission to 22 National law collleges / university.

You will have find out suitable law college / University meeting your interest /preference / requirement.

Age is not a concern for any studies except the least.  But if you are an employee shall obtain permission for higher studies.  You can search Google for CLAT exams.