hi,

see age is not a bar and for pg courses most of the universities has no specific age limit, however exam pattern is different for different colleges, I have mention some institute name which offers msc in forensic science,

Amity University

Chandigarh University

Galgotias University

Gujarat University

GD Goenka University

Banaras Hindu University

Maharshi Dayanand University

Babasaheb Bhimrao Ambedkar University

Maharaja Agrasen University

Kurukshetra University

books you may follow,

Forensic Science in Crime Investigation by Nabar BS

Forensic Science: An Introduction to Scientific Crime Detection- by Walls

Forensic Science: Principles & Concepts by Nishant Singh

Forensic Science: The Basics, Second Edition by Jay A. Siegel

Forensic Science UGC Net/JRF-MCQ's by Dr. Anu Singla