[Dougal]

True, 1953 is 70 years ago after all. Anyone under the age of 75 probably doesn't remember it. And Charles could potentially last 20 years, since he's in his 70s now and his parents lived to their 90s. Nobody who WAS around for Elizabeth's coronation is likely to be around for William's, and even those who were kids at the time (i.e. in their 70s now) have a high chance of not living that long. Charles's will be their only chance to see one.

Speaking as someone born in late 1953 that certainly holds true for me.

I wouldn’t be so sure of this. My parents were born in 1942 and 1943. Their parents (my grandparents) lived into their 100s and their grandparents (my great grandparents) lived into their late 90s. Should Charles reign for 20 years, I fully expect that at least one of my parents will see William ascend the throne.