She was the longest serving Monarch in British history. Six years longer than Victoria.
I think you mixed up your I's and V's. King George IV died in 1830.
I was 5 when she became Queen but can't say I remember much about her father.
I do remember watching the Coronation. It was a big deal at the time because the film was flown to Canada on a RAF Canberra jet bomber and we got to see it several hours after the actual event. It was the first overseas event televised in North America on the same day.
Thanks for pointing out my error. I fixed it.