In old age. For example, Isn't it rather late in life for your grandmother to go trekking in Nepal?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use late in life in a sentence
Sue Katz took inspiration from a real-life GLBT Senior Dinner Club to detail a late-in-life lesbian awakening.
But didn't Jars defend the discredited late-in-life theories of Akers?The Huddlers | William Campbell Gault