Early adulthood
begins in late teens/early 20year and lasts through the 30 year. 
Early adulthood is a time of:
establishing personal and economic independence
developing a career
Identity exploration, especially in love and work
selecting a mate
learning to live with someone in an intimate way
starting a family
rearing children 
Physical Development in Early Adulthood :
Physical strength typically peaks in early adulthood (the 20’s and 30’s).
Physical changes are minimal during this phase , the weight and muscle mass change as
a result of diet , exercise ,pregnancy and lactation 
Growth and strength in early adulthood, then slow process of decline afterwards .
Decline affected by health and lifestyles .