Yéye hé nǎinai xiāngbàn le wǔshí nián, zhēnshì hǎo lǎobàn.
Grandpa and grandma have been together for fifty years, truly wonderful life partners.
Tips
usage
老伴 is used exclusively by or about elderly people referring to their spouse. It is warmer and more intimate than 配偶 (spouse) and implies a long life shared together. Young couples would not use this term.