I never have a thematic intention at the outset. The story informs the theme for me rather than the other way around. But as it happens... this is, at least to a degree, about getting old and the rapid passage of our lives.
Stephen KingThe Tower. He would come to the Dark Tower and there he would sing their names; there he would sing their names; there he would sing all their names. The sun stained the east a dusky rose, and at last Roland, no longer the last gunslinger but one of the last three, slept and dreamed his angry dreams through which there ran only that one soothing blue thread: There I will sing all their names!
Stephen KingI do not aim with my hand; he who aims with his hand has forgotten the face of his father. I aim with my eye. I do not shoot with my hand; he who shoots with his hand has forgotten the face of his father. I shoot with my mind. I do not kill with my gun; he who kills with his gun has forgotten the face of his father. I kill with my heart.
Stephen King