Hey there
Following are the eligibility
1. Date of birth is July 02, 2001, to July 01, 2004 for NDA 1
2. Minimum height is 157 cm for male and since you have 5.5 feet you are eligible.
Check the link
https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/nda-eligibility-criteria/amp&ved=2ahUKEwi1nfrBwsnpAhXI7XMBHYY6Br0QFjAAegQIBBAB&usg=AOvVaw1I0C9hFQPh7j-5oJDaK70E&cf=1
Good luck
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