When are 5 Seconds of Summer’s Birthdays and how old are they you ask? Ask no more!
- Luke Hemmings was born on the 16th of July, 1996. Making him 18 years old.
- Calum Hood was born on the 25th of January, 1996. Making him 18 years old.
- Michael Clifford was born on the 20th of November, 1995. Making him 18 years old.
- Ashton Irwin was born on the 7th of July, 1994. Making him 20 years old.