This idiom means that what other people have or do looks preferable to our life. The complete phrase is 'The grass is always greener on the other side of the fence'.
The rough and tumble refers to areas of life like business, sports, politics, etc, where competition is hard and people will take any advantage that they can.
The sands of time is an idiom meaning that time runs out either through something reaching an end or through a person's death. It comes from the sand used in hourglasses, an ancient way of measuring time.
When an older person behaves foolishly, it seems worse than when a younger person does the same, especially in relationships, as an older person should kknow better.
(UK) The thin blue line is a term for the police, suggesting that they stand between an ordered society and potential chaos. (Police uniforms are blue.)
A thousand pound gorilla in the room is an idiom which can be used to say something is the biggest problem in the relationship between two or more persons or countries.
If prices go through the ceiling, they rise very quickly.
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