Hi,

The eligibility criteria for SSC CHSL is that the age of candidates should be between 18-27 years. Candidates must be 18 years of age as on 1 January, 2020. It means candidates who are born not later than 1 January, 2002 are eligible to sit for the exam. So, for 2020, you are not eligible for the examination as you are born after 1 January, 2002. You can appear for the examination next year in 2021.

Check the detailed eligiblity criteria here: https://competition.careers360.com/articles/ssc-chsl-eligibility-criteria