As quoted from Deped MEMORANDUM DM-CI-2020-00080:

“Age qualification for Kindergarten learners in both public and private schools should be five (5) years old by June 1 of every calendar year.

For schools commencing their school year beyond June, the requirement that Kindergarten learners should be five (5) years old by June 1 and the extension period ending on August 31 shall be adjusted. For schools commencing their school year in July, Kindergarten learners should be five (5) years old by July 1 and the extension period shall be until September 30. For schools commencing their school year in August, Kindergarten learners should be five (5) years old by August 1 and the extension period shall be until October 31.”