The speaker looks at their own hands and notices something odd: they still curve like breasts. The poem doesn't say whose hands they are or what the "36 years" refers to, so the number stays a little mysterious. Judging by the exclamation mark, it could be a span of marriage, a career, or simply the time since the speaker first noticed this resemblance. What matters is the sense of time passing while one small physical detail stays the same.
The tone is a mix of surprise, humor, and tenderness. "Nothing changes!" can be read as a laugh at oneself, but it may also carry a faint wistfulness, since so much else about a life usually does change over that long. The comparison is intimate and a bit cheeky, turning an ordinary part of the body into something sensual and gently absurd. The mood is light, wry, and quietly reflective, all in two short lines.