The following is the standard height chart for boys of all ages: 1 year old 78-84 cm 2 years old 86-92 cm 3 years old 95-101 cm 4 years old 101-107 cm 5 years old 108-114 cm 6 years old 115-121 cm 7 years old 122-128 cm 8 years old 128-135 cm 9 years old 134-142 cm