They don't fit my lifestyle but I have opinions based on observations. They look more pirate-y, and just plain costume-y when they than have heels than when they're flat, and the flat heel works better with the more sporty look I like best.
I like the flat ones with short skirts and tights, or jeans and leggings, worn with turtlenecks and crewnecks, simple sweaters with no details. I especially like them on women with short hair, there's a kind of Peter Pan androgyny to the look that is neither tough nor hard looking.
No opinion on age, not an important factor with these, except that it might be easier for an older woman with a more sophisticated wardrobe to style them elegantly.