Sprague Grayden was 30 in Paranormal Activity 3 when she played the character 'Kristi Rey'.
That was over 13 years ago in 2011.
Today she is 43, and has starred in 11 movies in total, 4 of those since Paranormal Activity 3 was released.
In Paranormal Activity 3, I think Sprague Grayden looks: