For humans, old is usually when you are 2/3 through your expected lifespan. Subjectively, someone can be "old" if they are part of an earlier generation. (To kids, all adults may seem old.)
For things, a person may consider them old when they are obsolete, or when they were built or constructed before he or she was born.
As the life expectancy nears the age of 80, the definition of elderly has moved upward, so that middle age may be as old as the late 50's. In the US, "senior citizens" usually applies to those eligible for Social Security payments and Medicare coverage, around the age of 65 to 67.
Some people might consider themselves as old when they experience health problems at an age they feel is old.
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a old person is qualified to be old when there over the age of 60 years old.
It's not old, but it's aware of how close old is. ;-) 39, 40 is old.
You are not even a year old.
Approximately how old is the Earth? 4.6 billion years old 3.8 billion years old 4.6 million years old 3.8 million years old
50 years old