At what "age" does one become old?

[imported_Imp]

38

Just past midway between 35 and 40.

 

[Arkaign]

John McCain

 

[marvdmartian]

The first time you groan while getting up from the couch.

 

[Tylanner]

31

 

[StormRider]

30 for women and 80 for men.

 

[StormRider]

Oops, no I d'int.