What is normal aging?

​A question most people ask, at least the folks over the age of 55.  

You may be someone who prefers not to think about it and pretend it doesn't exist. The fact that you're slowing down, have less energy, have trouble multitasking, forgetful at times, or not sleeping as well, all point to it. 

According to the Pew Research study, they found varying assumptions, depending on the age group -- the younger generations say old age begins between 60 and 74.
When survey respondents ages 18 to 29 were asked, "What chronological number does old age begin," most said 60. Middle-aged respondents put the threshold at 70, and those 65 and above say a person does not become old until 74. I’ll be 70 soon and disagree with them all! What about you? 

Other potential markers such as forgetfulness, retirement, becoming sexually inactive, experiencing bladder control problems, getting gray hair, having grandchildren are the subjects of perceptions. Nearly two-thirds of adults ages 18 to 29 believe that when a person frequently forgets a familiar name that marks the person old. 

Other makers like failing health, an inability to live independently, an inability to drive, difficulty with stairs, across all age groups, indicate to a certain degree as old age. (Pew Research, Growing Old in America)

Now that you might be approaching 55, 65 or 75, what do you consider old age?