Leaving past childhood and facing the unknown of adulthood is a component of adolescence. Another characteristic of this stage is moratorium which tends to end as adulthood begins. Given that the next stage (Intimacy) is often characterized by marriage, many are tempted to cap off the fifth stage at 20 years of age. However, these age ranges are actually quite fluid, especially for the achievement of identity, since it may take many years to become grounded, to identify the object of one's fidelity, to feel that one has "come of age". In the biographies "Young Man Luther" and "Gandhi's Truth", Erikson determined that their crises ended at ages 25 and 30, respectively: