Hello, you are eligible for NDA 2 in 2022 as the age limit is between January 2004-january 2008.Also candidates appearing in their 12th board or equivalent exams are eligible to appear in the army wings but as navy and airforce is considered the candidate should have completed or passed their 12th exam, For more information regarding NDA check this link https://competition.careers360.com/articles/nda-eligibility-criteria#NDA-Eligibility-Criteria-2021-Age-Limit

Hope this helps.