When you think about it, there is nothing clear or straightforward about this world. It is even possible for someone born after you to be older than you.
A person could be born at 1:00 am here in England, their friend in America could be born 2 hours later but they're in a different time zone and it is still the previous day over there so their records would show they're a day older than you, even though they were born when it is 3:00 am British time. If that person was born at 1:00 am on the 1st of January, it gets worse because their records will show they were born December the previous year. They would be born 2 hours after you but their records show they are a day older and born in a different year.
If you use my statement as an ice breaker in an awkwardly quiet room and it annoys them, you can blame your old man for mentioning it to you earlier.
You could be walking along the pavement at 7 kph but what speed are you moving at? The Earth is going close to 67,000 mph around the sun and the earth is also spinning very fast and the speed varies depending how close you are to the equator. Half of the day the spin of the earth is going the same direction as the orbit and the other half it is moving against it. Suppose you can detect how fast the turf you walk on is moving, even that is not enough. The sun is also going around the centre of the galaxy and dragging the earth along with it. What about the universe, how do we know how fast the entire universe is moving? We could be moving at a million kilometres per second and have no idea.
Nothing is straightforward when you think about it, but don't think about it too much.
