Well, yes, there is an element of sadness to the song, but it is also an expression of love. That seems to fit very well with Hazel's story. The song is sung by the father as he reminisces on how fast his children have grown up and his life is winding down. He misses his youth and the boisterousness of his young children. But his children have grown up to be fine people and he is happy. He and Martha and Jonathan are in their "sunset years" but still enjoying their day.
Artemis
