And she got her wish; she has seven grandkids. But Costin isn't like most grandmas.
For The Early Show's Young at Heart series, correspondent Melinda Murphy found out Costin started her own business just last year.
To customers who call, she answers, "Grandma's Handyman Service. This is Grandma speaking."
Her company does home repairs.
"We do from major remodeling of kitchens and bathrooms all the way down to turning on swamp coolers, replacing washers and faucets," she says. "I like to do wood restoration myself."
She has six employees, including her husband, Theron Costin, who goes by the name "TC."
Asked if it is strange to work with him, she just makes funny noises. So what does TC think of his wife starting her own business? Laughing he answers, "Got her out of my hair."
The truth is, Yvonne Costin has been working around the house for years, repairing the family's front doors and other odd jobs.
"I'm from the old school: Use it up; wear it out; make it do; or do without," she says.
Of course, it's not always easy working for a grandma.