"We have so much to be thankful for and continue to focus on what we still have rather than what we've lost," his wife Kim Woolen tells PEOPLE exclusively

By Melody Chiu
April 22, 2015 06:05 PM
Lisa Lake/Getty

Country fans will celebrate the 40th anniversary of Glen Campbell‘s Rhinestone Cowboy next month, but the singer and his family are toasting another milestone this week – his 79th birthday.

“We were very excited to be celebrating Glen’s birthday with him today in Nashville,” Campbell’s wife Kim Campbell tells PEOPLE exclusively of the “very small and intimate party,” which included burgers from Five Guys and Campbell’s favorite dessert – ice cream cake.

The couple’s children Ashley and Shannon were in attendance, along with producer Carl Jackson (the singer’s banjo player of 12 years) and Campbell’s longtime caregiver Amanda Carungi.

“He was laughing and enjoyed the food, smiles and hugs,” says Kim. “He got a lot of messages today from friends and family wishing him happy birthday.”

Campbell's cake
Courtesy Kim Woollen

Diagnosed in 2011 with Alzheimer’s disease, Campbell currently resides in a full-time memory care facility near the couple’s home.

“Living with Alzheimer’s is all about living in the moment, so we try to fill every moment with him with love, laughter, music and joy,” says Kim. “We have so much to be thankful for and continue to focus on what we still have rather than what we’ve lost.”

The Campbells are also gearing up for the television debut of the singer’s documentary I’ll Be Me, which followed the country legend and his family on tour as the performer’s mind degenerated.

“He is our hero,” says Kim. “Through the film, he helped remove the stigma of getting that diagnosis and made it okay to discuss the disease openly and without shame.”

I’ll Be Me, which shares the same name as a foundation spearheaded by the film’s director James Keach, airs June 28 on CNN.

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