The world is full of cliches that neatly sum up a solution or explanation for nearly every situation. "Easy come, easy go" and "No good deed goes unpunished" are among some of the more widely known.
Another is "The only constant is change." This jewel is attributed to Heraclitus, a greek philosopher who died in 475 BC. Actually, his original statement was "Nothing endures but change." A comparison of the two statements proves his point.
The problem is that neither life nor anything else is not as simple as a few words strung together.
There are all sorts of quizzes going around that start out "you know you're getting older if ... "
A laundry list of "old stuff" follows.
A few years back, I came up with another one, all on my own, and I think it bears noting again.
Here it is: You know you're getting older if you don't use the whole keyboard on your computer.