Describing themselves as 'over 60', the duo have documented their coordinated fashion style on their Instagram page bonpon511.
Managing to match at least one accessory, colour or pattern, their style has been praised by their 179,000 followers, with many highlighting their long-term desire to be like the couple in the future.
"You guys look fantastic, what an inspiration," one Instagram user wrote.
In their most recent post the couple expressed their gratitude, having built a considerable following over the last week as news of their account has spread internationally.
"Thank you everyone, a lot of followers and a nice comment❣️I am very happy that overseas followers have increased😍😍It is difficult to return comments individually😓Instead of replying "LIKE❤️". I look forward to working with you.😊😊＊"
Photos they have shared have been taken both within Japan and abroad during a holiday to Italy, with their posts featuring hashtags including: #instafashion, #whitehair and #over60.