99
Somewhere between 19-22 months old. Sources - My Guesses
One Direction or 1D
If D is a unit that can be measured and 1 is the number of Ds, then D * 1 = 1D. As for how 1D is, you'll have to wait for girls to answer. I've had 0 D's and plan to keep it that way. But I hear 1D is very good.
Niall James Horan is in One direction (1d)
18years old
18 :)
99
=) hes 16 years old
22
Zayn* He is 19.
U smelll
harry is 18
Right now Niall is 18.
Harry's 18
As of 2012, Zayn Malik is 19 years old.
Liam is 20 years old and he has blond hair and beautiful eyes