年よりをからかってはいけない。

year; many years; age; past one's prime; old age

than; from; out of; since; at; on; except; but; other than; more

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to ridicule; to tease; to mock; to chaff; to razz; to banter with; to make fun of; to poke fun at; to make cracks about

if ... then; when; and; why don't you...?; the more (one does something); because; since