Myelin development over time in preterm children remains unclear. This study compared T1/T2 myelin maps for 81 very preterm (VP) and 29 full-term children between 7 and 13 years of age. On average, VP children had higher T1/T2 ratios than full-term children in most white matter tracts and deep gray matter structures at both time points. This may reflect compensation or developmental catch-up. T1/T2 ratios increased from childhood to adolescence in both VP and full-term children, shedding light on typical and atypical myelin maturation.