caducity
debilitation
debility
decay
deterioration
dilapidation
disease
dotage
enervation
feebleness
incapacity
infirmity
malaise
old age
ruin
senescence
senility
sickliness
superannuation
unhealthiness
weakness
impairment
ailment
baldness
decadence
deformity
degeneracy
dementia
destitution
disintegration
disrepair
elephantiasis
emaciation
frailty
hydrophobia
imbecility
indigence
inertness
palsy