| disease(noun, weakness, delicacy, inadequacy, shakiness) |
| dissolution(noun, drop, fall, failure, deterioration) |
| dotardism |
| downgrade(noun, drop, fall, failure, deterioration) |
| downturn(noun, drop, fall, failure, deterioration) |
| drivel |
| drop(noun, fall, failure, deterioration, falloff) |
| drug addiction |
| dust of ages(expression, idiom) |
| dwindling(noun, drop, fall, failure, deterioration) |
| ebb(noun, drop, fall, failure, deterioration) |
| ebbing(noun, drop, fall, failure, deterioration) |
| effeteness(noun, weakness, delicacy, inadequacy, shakiness) |
| elderliness |
| eldership |
| enervation(noun, weakness, fault, lack, lapse) |
| enfeeblement(noun, drop, fall, failure, deterioration) |
| etiolation(noun, weakness, delicacy, inadequacy, shakiness) |
| evening of life(life, period, age) |
| exhaustion(noun, weakness, delicacy, inadequacy, shakiness) |