Hang on, parents. After the terrible twos come the goal-oriented threes. Kids seem to grow into the ability to act in pursuit of goals outside of what they can immediately sense sometime around that age. Although adults take goal-directed action for granted, it’s not in us from birth but rather emerges in a normal developmental timeline that, according to this and similar studies, appears to emerge roughly between the ages of 2 and 3 years — hence the “terrible twos.”