作词 : Sarah Saint James/Eric Leva
 作曲 : Sarah Saint James/Eric Leva
Eighteen when you met me
Now you know me inside out
More than I know myself
So hey, let me just take a second
All of the years gone by
It just hit me
La-love, twenty-something years young
Ain't been single enough
La-love, you say it too much
And the pressure builds up, yeah
Twenty-something years old
And I’m all that you know, know, know, know, know so
You've got a one-track mind, hey
Don't you think it’s bittersweet
I'm one foot out the door
You're always wanting more
We meet in the middle
I **** up the chemistry
But you want me anyway
And that makes me more afraid
Don't that hurt you a little?
Ooh na, it's so
Bittersweet, bittersweet, bittersweet
(Bittersweet, bittersweet, bittersweet)
Ooh na, it's so
Bittersweet, bittersweet, bittersweet
(Bittersweet, bittersweet, bittersweet)
Can't picture me without you, yeah
And I don't really want to, yeah
But that could be an issue, yeah
I think I met you too soon
Cause I, I, I, I, I don’t feel emotional
When I, I, I, I, I get too comfortable
La-love, twenty-something years young
Ain’t been single enough
La-love, you say it too much
And the pressure builds up, yeah
Twenty-something years old
And I'm all that you know, know, know, know, know so
You’ve got a one-track mind, hey
Don't you think it's bittersweet
I'm one foot out the door
You’re always wanting more
We meet in the middle
I **** up the chemistry
But you want me anyway
And that makes me more afraid
Don't that hurt you a little?
Ooh na, it's so
Bittersweet, bittersweet, bittersweet
(Bittersweet, bittersweet, bittersweet)
Ooh na, it's so
Bittersweet, bittersweet, bittersweet
(Bittersweet, bittersweet, bittersweet)
(Bittersweet, bittersweet, bittersweet)
(Oh, oh-oh, oh, oh-oh)
Twenty-something years old
And I'm all that you know, know, know, know, know so
You've got a one-track mind, hey