You can find me as a veg,
In a series I'm a language.
But now, my hair is gray,
In short, I'm Array...
Who am I?
My guess is:
Bean[s]
You can find me as a veg,
Bean is a veg
In a series I'm a language.
Rowan Atkinson is in the TV series Mr. Bean
But now, my hair is gray,
Mister Bean (Rowan Atkinson) is getting old and grey like all of us (http://www.gstatic.com/tv/thumb/persons/56849/56849_v9_bb.jpg)
In short, I'm Array...
Array=RA=Rowan Atkinson.
Drawing heavily on rhsquared’s attempt, the answer is...
Rowan Atkinson
You can find me as a veg,
He is most famous for portraying the character Mr. Bean. Beans may technically be a legume, but colloquially they can reasonably be classified as a vegetable.
In a series I'm a language.
He has starred in a series of movies as the would-be spy Johnny English. English is a language.
But now, my hair is gray,
He is now 64 years old — gray hair is to be expected.
In short, I'm Array...
His initials are RA, a rebus for Array.