Milestones of physical Development By Kingdiky1 Apr 26, 2017 Infancy Newborn to age 1 Apr 26, 2019 Toddlerhood Age 1-2 Apr 26, 2021 Early Childhood Ages 3 - 5 Apr 26, 2025 Middle childhood ages 6 - 10 Apr 26, 2030 Adolescence Ages 11 - 19 Apr 26, 2042 early adult hood Ages 20 - 39 Apr 26, 2063 Middle Adulthood Ages 40 - 65 Apr 26, 2085 Older Adulthood Age 66 +