Which of jean piaget's stages of cognitive development is characterized by abstract thinking and the creation of hypotheticals?

Conctrete operational

The third stage in Piaget's theory of cognitive development  is known as the concrete operational. This period traverses the time of middle infancy it starts almost at the 7 years of the age and extends until roughly at the age of 11 and is designated by the evolution of logical thought. As the title suggests, the concrete operational stage of development is a time when the child is competent of implementing a change of rational operations and decisions using concrete thoughts.

is there a year set? the question is incomplete

its b i googled it wish u luck