dear student,

there is no such age limit to continue your studies.

you can purse your mtech and phd at any age.

as you have done btech in cse the best options to continue your studies are

mtech cse

mtech it

mtech data science

mtech AI

or you can appear in the GATE exam and have a phd done in any college by fullfilling the college requirements according to it.

hope this helped.