Okay, having to suck in tears here as am a mother of teenage son who has just come in with his best friend also aged 16. I also have two teenage step-daughters, and this song does it for me every time as they are hurtling towards adulthood. Thank you Abba 
Slipping through my Fingers
Schoolbag in hand, she leaves home in the early morning
Waving goodbye with an absent-minded smile
I watch her go with a surge of that well-known sadness
And I have to sit down for a while
The feeling that Im losing her forever
And without really entering her world
Im glad whenever I can share her laughter
That funny little girl
Slipping through my fingers all the time
I try to capture every minute
The feeling in it
Slipping through my fingers all the time
Do I really see whats in her mind
Each time I think Im close to knowing
She keeps on growing
Slipping through my fingers all the time
Sleep in our eyes, her and me at the breakfast table
Barely awake, I let precious time go by
Then when shes gone theres that odd melancholy feeling
And a sense of guilt I cant deny
[. From: www.elyrics.net/read/a/abba-lyrics/slipping-through-my-fingers-lyrics.html .]
What happened to the wonderful adventures
The places I had planned for us to go
(slipping through my fingers all the time)
Well, some of that we did but most we didnt
And why I just dont know
Slipping through my fingers all the time
I try to capture every minute
The feeling in it
Slipping through my fingers all the time
Do I really see whats in her mind
Each time I think Im close to knowing
She keeps on growing
Slipping through my fingers all the time
Sometimes I wish that I could freeze the picture
And save it from the funny tricks of time
Slipping through my fingers...
Slipping through my fingers all the time
Schoolbag in hand she leaves home in the early morning
Waving goodbye with an absent-minded smile...