how old was soon yi when she was adopted

Soon Yi Previn was adopted when she was about 7 or 8 years old. She was born around October 8, 1970, and was adopted by Mia Farrow and André Previn in 1978 after being found abandoned in Seoul, South Korea, in 1976. At the time of her adoption, she had learning disabilities and was around 7 years old, according to multiple sources.