Yes you are eligible for NDA 1 2020.

As per the official notification a candidate born on or after 2nd July 2001 and on or before 1st July 2004 is eligible to appear for NDA 1 2020.

For more details refer to the official notification at the link given below

https://www.google.com/url?sa=t&source=web&rct=j&url=https://upsc.gov.in/sites/default/files/Notif-NDANA-I-2020-Eng.pdf&ved=2ahUKEwjN9ZHm3ZTnAhWPbSsKHSpcB-MQFjACegQIAhAB&usg=AOvVaw2U7xo_xJMK7Tu_I7F4ZGM1