The poem sets two images side by side and lets us feel the link between them. First comes the picture of very old people gripping whatever is nearby, a railing, a chair, a doorframe, because the world around them has started to feel unfamiliar. Then, in the last two lines, the speaker points to snow settling on daffodils. Spring flowers are meant to signal that winter is over, so a late snow seems like the season has lost its way, just as the elderly feel the world has lost its way.
The speaker doesn't say outright how they feel, but the tone is gentle and sympathetic, with a note of unease. There's tenderness toward the old people, and the daffodils seem just as vulnerable. The mood is quiet and a little sad, yet it isn't hopeless. The word "cling" suggests that holding on is still a kind of strength, and the short, sparse lines leave room for the reader to sit with that.