The needs of the same human being may differ at different stages of life. Can there be one Dharma for all stages?

From infancy till old age, our bodily, psychological and even spiritual change and evolve. Also, their faults or risks differ at each stage of life. For instance, the greatest "fault" of an infant is ignorance of the world, and simultaneously, her greatest need is to physically explore. The same infant may grow into a youth whose greatest fault is lack of self-knowledge, and his/her greatest need is to explore the word of relationships and seek romance. The same youth may grow into an old person whose greatest fault may be a false sense of power, authority and ownership over other people, and whose deepest need may simply be peace and rest. So, is there one dharma preaching for all stages of life (or stages of evolution) in Buddhism? or are there many?