Thirteen by Elliott Smith is a tender, reflective song that delves into the themes of young love, nostalgia, and the innocence of teenage years. It is a cover of the classic song by Big Star. Elliott Smith's version adds a layer of melancholic introspection, highlighting the bittersweet memories of adolescence and the intensity of first love. Poignant moments in the song include the expressions of vulnerability and the longing for simpler times, encapsulating the universal experience of growing up and the poignant realization of fleeting youth.