3 scores, one decade, five years seven decades five years
7.5 decades
.75 centuries a senior
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It is: 75,000,000 or as 7.5*107 in scientific notation
I've used them for many years and never heard of another name.
a millennium
There are no such integers. In fact, there are no real numbers that satisfy the requirements.
That is by definition of the word "century". Humans like to count in powers of 10 (100, 100, 1000, etc.), since it is easiest to work with (with the numbering system we use), so humans invented a special name for "10 years", and another for "1000 years", and yet another for "100 years".