Tereshkova was exactly ten years younger than the youngest Mercury Seven astronaut, Gordon Cooper.

Entity and relation annotations:
id: 0
type: entity
value: text: Tereshkova
labels: <Person>
id: 1
type: entity
value: text: Gordon Cooper
labels: <Person>
id: 2
type: entity
value: text: Mercury Seven astronaut
labels: <Title>
type: relation
to_id: 2
labels: Person:holds_title:Title
from_id: 1