[Verse 1]
Yeah, I could see you right now
Friday night home team
Writing out "Go Bulldogs" in glass chalk on your Jeep
I know you had a wild side
Probably snuck a beer or two
I bet that every boy in school had a little crush on you, yeah

[Pre-Chorus]
And all the yearbooks and pictures I've seen
Girl, the only thing missing was me

[Chorus]
If I knew you at eighteen
We'd be mainstream
Windows down all summer, singing "One Headlight"
I could've been your perfect, nervous, first kiss
Wishing that I could've kept you out all night
The problem with forever
Is it ain't long enough
I wish that I could go back and we'd fall in love
Back when we were eighteen
If I knew you at eighteen, eighteen, yeah

[Verse 2]
Would've followed you to college
Pissed off my mom and dad
Well, they would say we're too young and I'd tell them it's too bad
Would've saved you from the first time
Somebody broke your heart
You always would've been mine if I'd been there from the start
[Chorus]
If I knew you at eighteen
We'd be main stream
Windows down all summer, singing "One Headlight"
I could've been your perfect, nervous, first kiss
Wishing that I could've kept you out all night
The problem with forever
Is it ain't long enough
I wish that I could go back and we'd fall in love
Back when we were eighteen
If I knew you at eighteen, eighteen, yeah

[Bridge]
A couple extra summers, I'll take what I can get
I would've loved you sooner, baby, if we would've met
Back when we were eighteen
Back when we were eighteen, eighteen, yeah

[Chorus]
If I knew you at eighteen
We'd be mainstream
Windows down all summer, singing "One Headlight"
I could've been your perfect, nervous, first kiss
Wishing that I could've kept you out all night
The problem with forever
Is it ain't long enough
I wish that I could go back and we'd fall in love
Back when we were eighteen
If I knew you at eighteen, eighteen, yeah