Standard (EADGBE)

You may tire of me as our December sun is

 setting because I'm not who I used to be

No longer easy on the eyes but these wrinkles masterfully

 disguise the youthful boy below

who turned your way and saw something he was not looking

 for: both a beginning and an end

But now he lives inside someone he does not

 recognize when he catches his reflection on accident

etc.