Why does the journey to a place you've never been before seem to take longer than when you return? Tyler Cowen discusses the tourist illusion as an example of the difference between subjective and objective time. Stephen Hawking, Stephen Hawking, Stephen Hawking, Stephen Hawking might probe the issue of objective time, but it's an interesting issue.
To me, it seems to be a question similar to whether toilet rolls gets used more, as it runs out; a roll of toilet paper appears to diminish at an increasing rate.
On a full roll of toilet paper there's perhaps four or five sheets on the outer layer, however when you're almost out one sheet can wrap around the entire tube. Since the width of each tissue is constant, a constant usage will mean that the roll (as measured across) will disappear at an increasing rate.
Each sheet "seemed" to be longer at the beginning. When you're ten, a year is a tenth of your life. When you're fifty, another year will only be a fiftieth.
Just like toilet roll, every year, or sheet, is of exactly the same length, but as you age it passes ever faster.
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