Your title suggests to me that you are an older individual and the picture of this young lady is how you visualize yourself or how you feel inside. Just a thought, but if I am correct in the above assumption than if you used, say an arm holding a cane as a leading line from the camera to the subject it would have really helped to characterize your picture. Nice shot in and of itself though.
If I knew this gal, this shot would for sure be on the wall. Excellent. The only minor pick I have is the cropping on top to bottom is off. Your left to right is even but the bottom has less than the top.
A very pretty young lady and she illustrates your title nicely. The exposure is super and the backlighting gives nice highlights in the hair and on the jeans. May we all remain "Young at Heart"!
I like this. Strong composition. I like the DoF. Good lighting, although I wish there were highlights on the model's face rather than her hand. Yellow element in the background is distracting. Really good expression of the theme.