It's difficult to agree in this subject but here you can see some pictures to help you to understand. It's a continuous that may be interrupted at any moment. EIGHT STAGES OF PSYCHOSOCIAL DEVELOPMENT By Erick Erickson According to William Shakespeare: 1.- the infant , 'puking on the nurse’s arms'; 2.- “the whining schoolboy … creeping like a snail unwillingly to school;' 3.- the lover ( teenager ), writing ballads 'made to his mistress' eyebrow' 4.- the young man 'jealous in honor, sudden and quick to quarrel;' as a soldier. 5.- the middle-aged man 'round bell… full of saws;' the age of justice. 6.- the emaciated old man 'with spectacles on his nose…[with] childish treble [of voice]”; 7.- and the last stage, a ' second childishness and mere oblivion, sans teeth, sans eyes, sans taste, sans everything'; dotage and death.