Eley said the children helped his grandmother open her gifts, including a mink blanket and a mattress topper, along with cards from the Queen, Governor-General Dame Patsy Reddy and Prime Minister Jacinda Ardern.
"They showed them to Lena and said what they were," he said.
"Some of the kids asked her about what she did when she was little and what she did for a job. She enjoyed that. She had a really good time. She was more sprightly now than other times I've seen her.
"She enjoyed the singing and dancing the kids were doing for her. It was the kids who made her day."
Rest home activities manager Pauline Ferris said everyone had an "awesome day." The children, and Lena, had thoroughly enjoyed themselves.
"She was quite overwhelmed," she said.
Lena Evelyn Wilkinson was born on June 11, 1912, and is officially the oldest woman in New Zealand. She grew up in Shannon, in the Manawatū, and began her working life in Wellington, as a seamstress. at 17.