I do not agree with your perspective on “objective” measures. I will take age as an example. Like every other points of your list it is a fuzzy concept. However

I do not agree with your perspective on “objective” measures. I will take age as an example. Like every other points of your list it is a fuzzy concept. However it looks rigorous and well defined because: 1 the scale of numbers we usually use is sufficiently large to smooth away the fuzziness at the origin. 2 Age is usually artificially quantised in years. This seems transparent because a year is in itself a very precise measure of time but a lot of information is lost in this quantisation. 3. In its administrative form it seems well-defined because it actually is a platonic construct. The fact that it is measured since someone is birthed and not for example since its inception is totally arbitrary in regards to a lot of uses it’s made for. If someone was born after seven months instead of nine months, he will arbitrale counted as older.