Four short lines imagine the speaker's own death, and what's striking is how calm they are. The speaker pictures lying at the undertaker's, "in the light," which sounds less like a dark, frightening room than a bright, quiet one. Death here is almost gentle.
The real surprise comes at the end. The speaker says they will have "no body / to give to age to tend." Usually we think of death as a loss of the body, but here it is also an escape. Age is pictured as a kind of caretaker or jailer that needs a body to work on. Once the body is gone, age has nothing left to look after, and the speaker is free of it.
The title calls this a "little death song," and the tone fits: small, quiet, a bit wry. The speaker doesn't seem frightened or grieving. There is a hint of relief, even quiet humor, in turning the end of life into a way of slipping past growing old.