Children's Short Story Collection

I read this collection of stories in 5th grade and can't seem to find it. The main story I remember was a young person who knew they were nearing their death date. They found the man who painted the death dates and he changed it from 19 to 99 I think. The young person narrowly misses dying when 19. The title may have been something about rainbow?

>1 lilye23: When and where were you in 5th grade? That might help us narrow down the possibilities.