An incredibly heartwarming video has emerged from the US of an 86-year-old man serenading his bed-bound wife, whom he has been married to for 61 years, on Valentine's Day.

The video, filmed in Tulsa, Oklahoma yesterday, shows Troy singing to 82-year-old Corky, while his granddaughter films the amazing, tear-jerking moment.

"My grandmother suffered a stroke four months ago and has been in a nursing home ever since," the filmer wrote online.

"This is a Valentine's Day serenade from my grandfather equipped with flowers and balloons."

"My grandparents have been married for 61 years and struggle very much to make ends meet," she continued.

"My grandfather spent his last $100 to make her Valentine's Day extra special."

My grandmother suffered a stroke four months ago and has been in a nursing home ever since. This is a Valentine's Day serenade from my grandfather equipped with flowers and balloons. My grandparents have been married for 61 years and struggle very much to make ends meet. My grandfather spent his last $100 to make her Valentine's Day extra special.