My grandfather probably saw the most dramatic change over his lifetime.
When he was born in 1897 there were only horse & carts & the odd bicycle.
Heavier than air aircraft were developed & even broke the speed of sound.
Man walked on the moon.
He died in the mid 1980s.
My great-grandmother was born in 1899 and died in 2001. It boggles my mind thinking that she lived in three centuries, two millennia, and watched the world go from horse and buggy to Y2K!