presenile

As a noun terms

is .

As an adjective presenile is

before the onset of senility.

As a noun senility

is senescence; the bodily and mental deterioration associated with old age.

As an adjective presenile is

before the onset of senility.

As a noun onset

is a rushing or setting upon; an attack; an assault; a storming; especially, the assault of an army.

As a verb onset

is to assault; to set upon.

As an adjective presenile is

before the onset of senility.