There's no single age limit for PCS (Provincial Civil Services) exams across India. The upper age limit varies significantly depending on the specific state and the particular PCS cadre you're applying for. Some states may have different age limits for different categories (e.g., OBC, SC, ST).
To find the exact age limit, you must refer to the official notification released by the Public Service Commission (PSC) of the specific state you're interested in. These notifications are usually published on the PSC's website well in advance of the exam.