Standard Age Range for PhD candidates?

[CynicAl]

I plan to retake my GRE and build up my profile by working as a RA for 1-2 years in the field of my interest so that I can apply to PhD programs at credited universities next year or the year after. Though I know it's never too late to do your PhD. I was curious to know at what age most people started their PhD... 

[fuzzylogician]

Here are a couple of recent threads to get you started: 

 

Try to search for "what age" or "how old" -- this question has been asked multiple times.

[CynicAl]

Thank you!