99
Somewhere between 19-22 months old. Sources - My Guesses
Niall James Horan is in One direction (1d)
The oldest member in 1D is Louis Tomlinon.
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.
18years old
18 :)
99
=) hes 16 years old
2014 1D Asian Tour
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.