A lovely Chinese phrase!

百年同心 is a beautiful idiom that literally translates to a hundred years of togetherness or a century of unity、It is often used to describe a longlasting and harmonious relationship between two people, usually a couple, that has endured for a century or a lifetime.

When paired with (golden), it is often used as a blessing or a wish for a couple to have a longlasting and happy marriage, similar to till death do us part.

Is there something specific you'd like to know or discuss about this phrase?