In this poem, the narrator is feeling a bit despondent as he wanders around the Lake District in springtime. All of sudden, he comes across thousands of newly blossomed daffodils swaying in the breeze in front of a lake. The sight is so lively and beautiful that it fills him with joy. It wipes away his sad, lonely feelings. Not only does it make him feel better in the moment, but in later months, as he is stuck inside on his sofa, the memory of it fills him with bliss.
The poem is relevant for young people today because it illustrates that one doesn't have to spend large amounts of money—or even any money at all—to find happiness. Sources of joy are all around us, if we just have the eyes to see them. Nature has not changed since Wordsworth's time. We can still take walks, and we can still find sources of natural beauty that can lift up our hearts. If we can hold these small moments of joy in memory, they can also come back to make us happy in future times.