To me age can refer to age of the body, age of the soul or age of your mental state.
I'm 32. I have a few friends who are in their 50's and 60's and I dont consider them old at all.
I believe in rebirth and usually the term age to me refers to the age of the soul. The older the soul, the wiser the person, usually throughout their life. I find enormous respect towards the old souls, as I see that they've experienced much more in their lives. They see life as a journey, respect each moment as it is and don't pay too much attention to the detail such as age of the body or how to look 10 years younger 
I consider myself mentally old at the moment. That is, because I don't have the energy to do all the things I want to do, or things I used to do. Having said that, it is not something that can't be changed. Its just a mental state. Once things start to look brighter and I get more energy, I might feel very young and energetic even though I will be older in my body.
Edited: 07/07/2012 at 17:30