1. She turns 21 in June.

Question

2. She is turning 21 in June.
[Which one is right?]

Answer 1

Both are correct, but #1 is much more commonly used.

Answer 2

1. She turns 21 in June.
2. She is turning 21 in June.
3. She will turn 21 in June.
[Thank you. Does #1 and #2 mean #3?]