偕老

偕老	xié lǎo	to grow old together
偕	xié	in company with
老	lǎo	prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity / old (of people) / venerable (person) / experienced / of long standing / always / all the time / of the past / very / outdated / (of meat etc) tough