When it came to performing charitable works for youth and devoting her life to God, Ruby Marie Miller's energy was unparalleled.

As Ms. Miller got older, she, of course, slowed down as she approached 100.

Still, it's hard for her friends, Bible studies students and peers to believe that Ms. Miller, known as "Sister Ruby," was 106 years old when she died June 28 at St. Paul Health Center after complications from pneumonia.

Ms. Miller never revealed her age to those who knew her, leaving her friends guessing that she probably was years younger than she was.

Many of her students didn't know she had a sister - an older one. Her sister, Rose Harris, is 108 and Ms. Miller's only survivor. Nonetheless, she was able to travel from her home in Pittsburg, Kan., to be at her sister's funeral in Denver on July 7.

Her friends and former students recalled that Ms. Miller had the same amount of enthusiasm teaching the Bible at Sunday school in the twilight of her life that she had when she taught children in the late 1920s.

Generations of parents, children and grandchildren attended her Sunday school classes.

"Her energy - I just don't understand," said 85-year-old LaVerne Cook, who began receiving biblical instruction from Ms. Miller when she was 10 years old. Cook's children also followed suit and received their Bible instruction from Ms. Miller.

She was involved in numerous youth activities throughout the decades. For more than 50 years Ms. Miller rented buses to transport children to the Youth Christian Congress conventions held in other states. Ms. Miller hated accepting donations, but held bake sales and dinners to help raise money to pay for the transportation costs, her friends and students said.

Sometimes, Ms. Miller would pay for children to attend the Youth Christian Congress if their families couldn't afford the expenses, they said.

Among the other activities Ms. Miller organized for youngsters were the Sunshine Band, Junior Ushers, Youth Choirs and the Young People's Willing Workers.

Ms. Miller housed displaced children in her Denver home. Missionaries and ministers also took refuge at her home when they visited Denver, her students said.

It was her dedication to God that kept her going, her students said. Ms. Miller, they said, fasted every Tuesday and Friday.

Mr. Miller was born on June 8, 1902, in Yale, Kan., to Lot and Margaret Shaw Miller. As a child she moved to southern Colorado. She dropped out of school in eighth grade and went on to become a domestic worker in Trinidad. Ms. Miller moved to Denver in the 1930s and attended the Emily Griffith Opportunity School and the Charles Harrison Bible College. Ms. Miller never married or had children.

In addition to her parents she was preceded in death by five brothers and three sisters. Funeral services were held at Gethse mane Temple Church of God and Christ, 2586 Colorado Blvd.