[Verse 1: Alessia Cara]
So much harder to be honest
With yourself at twenty-something
Wish I knew what I'm becoming
And felt the ground while I was on it

[Pre-Chorus: Alessia Cara]
Hoping, waiting on a moment
Not knowing if it's coming or it's going
Mmm

[Chorus: Alessia Cara, Pentatonix, Alessia Cara & Pentatonix]
What if my best days are the days I've left behind? (I've left behind)
And what if the rest stays the same for all my life? (All of my live)
I'm running with my eyes closed, so it goes
You live and then you die (Live and die, but I)
But the hardest pill to swallow is the meantime
Are thе best days just the ones that wе survive?

[Post-Chorus: Alessia Cara & Pentatonix]
Ooh-ooh-ooh, ooh-ooh-ooh, ooh-ooh (The best days of our lives)
Ooh-ooh-ooh, ooh-ooh-ooh, ooh-ooh (Are they left behind?)

[Verse 2: Alessia Cara & Mitch Grassi]
If I had known to feel the fire (Yeah)
I would've thrown my arms up higher (Ooh)
Would've held on a little tighter
'Cause you don't know a thing you miss 'til it's behind you
Mmm
[Chorus: Alessia Cara & Pentatonix]
What if my best days are the days I've left behind? (I've left behind)
And what if the rest stays the same for all my life? (All of my live)
I'm running with my eyes closed, so it goes
You live and then you die (Live and die, but I)
But the hardest pill to swallow is the meantime
Are the best days just the ones that we survive?

[Post-Chorus: Alessia Cara & Pentatonix]
Ooh-ooh-ooh, ooh-ooh-ooh, ooh-ooh (The best days of our lives)
Ooh-ooh-ooh, ooh-ooh-ooh, ooh-ooh

[Chorus: Alessia Cara & Pentatonix]
What if my best days are the days I've left behind? (Best days, I left behind)
And what if the rest stays the same for all my life? (Best days)
What if the best days are the days I've left behind? (Best days, I left behind)
And what if the rest stays the same for all my life? (Best days)

[Outro: Alessia Cara & Pentatonix]
Ooh-ooh-ooh, ooh-ooh-ooh, ooh-ooh (Best days, I left behind)
Yeah, yeah, ooh (Best days)