10 Unhealthy Practices You Need to Stop Doing at Age 30 : Transitioning from being an enigmatic lady in your 20s to being a responsible woman in your 30s might hardly change what you feel about yourself and your body. You look into the mirror and the person who stares right back is still the same, magnificent you. But don’t be fooled, for however minute, your body is steadily changing and slowly aging in the inside.