Rewatching the movie, I realized that Carol hears a story about Alouette (satellite) that was launched in September 1962 and deactivated in September 1972 (and until today it hasn't crashed). Therefore, presuming that this conversation would take place during this period. With the information that Carol was 6 years old when this conversation took place, she could have been born in 1966-67. What do you think?
"Brother of Vers: A great rumble throughout the cosmos shook the moon, sun and stars in the sky. And so, little Alouette flew through the night."
In 1988-89, Carol tells same history to Monica (with 5 years).