Watch 90-Year-Old Grandfather Serenade Wife With Bing Crosby Classic for 70th Anniversary

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Bing Crosby performs at the Momarkedet opening show with his orchestra in Oslo on Aug. 30, 1977. 

"Let me call you sweetheart, I'm in love with you."

The 70th wedding anniversary is supposed to be the platinum anniversary, but no material gift could have been more heartfelt than the song now 90-year-old Paul Miller delivered his wife, Imogene. 

At a celebration in The Hot Springs, Arkansas, earlier this month, Miller sang Bing Crosby's "Let Me Call You Sweetheart" a cappella as he held her hand and stared into her eyes lovingly. 

The two love birds' anniversary was June 15 -- the same day as Miller's 90th birthday -- and had their party the weekend before. 

“Their story is really cute,” granddaughter Sarah Saragusa told ABC. “My grandmother is actually a few months older. She told my grandfather she wouldn’t marry him until he turned 20 so they got married on his birthday. She wanted him to be a mature man at 20 before they got married. They met at the Western Union, he really pursued her."

As for Miller, he told ABC that it took some rehearsing to get his performance right. 

"I started practicing so it would sound just right. I didn’t just reach up out of the clear blue sky to choose it," he said. "She’s the only one I’ve ever had. It started out when I was 18 and it’s gone along just as great as ever.”

Watch the video here: