Why does SN 12.66 say aging-and-death has acquisition as its source?

SN 12.66 says: > *The many diverse kinds of suffering that arise in the world headed by aging-and-death: this suffering has acquisition as its source, > acquisition as its origin; it is born and produced from acquisition. > When there is acquisition, aging-and-death comes to be; when there is > no acquisition, aging-and-death does not come to be.* Why does SN 12.66 say aging-and-death has acquisition (upadhi) as its source? Why doesn't SN 22.66 say aging-and-death has cancer or heart disease as its source?