13: Lose Yourself- Eminem
16: Gold Digger- Kanye West
18: Kiss Kiss- Chris Brown
21: Like a G6- Far East Movement Ft. Dev

I feel so old

Birth (October 31, 1995): Fantasy - Mariah Carey
13 (2008): Whatever You Like - T.I.
16 (2011): Someone Like You - Adele
18 (2013): Royals - Lorde

13: I Gotta Feeling - The Black Eyed Peas
16: Call Me Maybe - Carly Rae Jepsen
18: something later this year

13: Live Your Life
16: We Found Love
18: The Monster

13: Say It Right
16: Tik Tok
18: Stronger (What Doesn't Kill You)
21: Not yet but I'm pretty sure it will Kelly's new single.

13 - Gold Digger - Jamie Foxx (Ft. Kanye West)
16 - Whatever U Like - T.I. (Never heard it )
18 - Just The Way You Are - Bruno Mars
21 - Wrecking Ball - Miley Cyrus

Only really like the last one.

13: "Burn", Usher
16: "Umbrella", Rihanna
18: "I Gotta Feeling", The Black Eyed Peas
21: "Call Me Maybe", Carly Rae Jepsen

Summer birthday = All summer smashes

In April

13: Right Round - Flo Rida
16: We Are Young - Fun feat Janelle Monáe
18: Happy - Pharrell Williams
21: TBA 2017

13: James Blunt – You're Beautiful
16: Flo Rida – Right Round
18: Lady Gaga – Born This Way
21: Pharrell – Happy

Issue dates don't represent real periods, though.

13 years: Inside Your Heaven by Carrie Underwood
16 years: Viva La Vida by Coldplay
18 years: California Gurls by Katy Perry
21 years: Blurred Lines by Robin Thicke

#1's in Canada where I live:
13 years: Inside Your Heaven by Carrie Underwood
16 years: I Kissed A Girl by Katy Perry
18 years:California Gurls by Katy Perry
21 years: Blurred Lines

13 - Whatever You Like/T.I.
16 - Someone Like You/Adele
18 - Roar/Katy Perry
21 - I'll let you know in September 2016

13: My Boo - Usher/Alicia Keys
16: No One - Alicia Keys
18: Empire State of Mind - Jay Z/Alicia Keys
21: Diamonds - Rihanna

All this Alicia domination