sen-, sene-, seni-, sir- +

In literary contexts, the figure of an old man or simply a reference to an old man.

An old man is a boy again.

Old age is considered a second childhood for some elderly men.

1. An aged person; one who exhibits the weakness or diseases of old age.
2. Belonging to, suited for or incident to old age.
3. Forgetful, confused, or otherwise mentally less acute in later life.
4. Occurring in or believed to be characteristic of later life, especially the period after the age of 65 years.

A form of brain disorder marked by progressive and irreversible mental deterioration, memory loss, and disorientation; known to affect some people after the age of about 65 years.

The condition of being senile; old age or the mental and physical infirmity due to old age.

To make or become senile.

1. Older, elder; especially used after a person's name to denote the elder of two bearing the same name in a family; also (after a simple surname) the elder of two boys of the same surname in a school, etc.
2. A term for an elderly person, especially one who is past the age of retirement.
3. Someone ranking before others in virtue of longer service or tenure of a position; superior to others in standing.

1. The state or quality of being senior; priority by reason of birth, a superior age.
2. Priority or precedence in office or service; especially military.
3. Superiority in standing to another of equal rank by reason of earlier entrance into the service, or an earlier date of appointment.

The period of old age, especially its debility.

1. A change of vision in old people whereby myopia is corrected to normal vision.
2. Improvement in near vision of old people.

It usually precedes the development of nuclear (nucleus membrane) cataract (opacity of the lens of the eye, its capsule, or both).

A Spanish term of address equivalent to "sir" or "Mr.", used alone or capitalized and prefixed to the name of a man.

The Italian form of title or address for a highly respected man or a man of advanced age. It is equivalent to English "sir".

A form of sire, a respectful form of address for a king or lord; from Latin senior "older" through Old French and the source of English senior.

1. The male parent of a four-legged animal; especially, a domesticated animal; such as, a stallion or bull.
2. An archaic term showing a respectful form of address for a king or lord.
3. Another archaic reference to a male ancestor or a forefather.

1. Originally, "sirly, sirlike", i.e., assuming "lordly airs".
2. Bad-tempered, unfriendly, rude, and somewhat threatening.