KER will continue to be in vogue for the age of admission to class I: five years

https://english.mathrubhumi.com/news/kerala/age-6-or-5-govt-s-number-game-for-ist-grade-1.2859568

G.O.(MS) 117/12/G.Edn dated 12.04.2012

Government are pleased to order that existing provisions in KER will continue to be in vogue (ie. the age of admission to class I shall be five years for all the schools of the state) until the Kendriya Vidyalayas controlled by Government of India also switch over to age six as implied in the RTE Act.

http://archive.education.kerala.gov.in/Downloads2011/Order/class1admission_19.4.2012.pdf

National Education Policty 2020

The curricular and pedagogical structure of school education will be reconfigured to make it responsive and relevant to the developmental needs and interests of learners at different stages of their development, corresponding to the age ranges of 3-8, 8-11, 11-14, and 14-18 years, respectively. The curricular and pedagogical structure and the curricular framework for school education will therefore be guided by a 5+3+3+4 design, consisting of the Foundational Stage (in two parts, that is, 3 years of Anganwadi/pre-school + 2 years in primary school in Grades 1-2; both together covering ages 3-8), Preparatory Stage (Grades 3-5, covering ages 8-11), Middle Stage (Grades 6-8, covering ages 11-14), and Secondary Stage (Grades 9-12 in two phases, i.e., 9 and 10 in the first and 11 and 12 in the second, covering ages 14-18).

https://www.education.gov.in/sites/upload_files/mhrd/files/NEP_Final_English_0.pdf#page=12