• Noun: the point or degree to which something extends; examples: "the extent of the damage", "the full extent of the law", "to a certain extent she was right"
• Noun: the distance or area or volume over which something extends; examples: "the vast extent of the desert", "an orchard of considerable extent"
Age does not protect you from love. But love, to some extent, protects you from age.
It takes considerable knowledge just to realize the extent of your own ignorance.