There are several studies on brain connectivity at different ages. The projects mentioned in the book can be found here:
Twin study of the Human Connectome Project, ages 22-35 years
Developing Connectome Project, pre-term and early years
Philadelphia Neurodevelopmental Cohort, ages 8-21 years
Child Mind Institute Healthy Brain Network, ages 5-21 years
Longitudinal IMAGEN Europe study, ages 14-22 years
NKI/Rockland study, ages 6-85 years.
UK Biobank Imaging project