Dave Rowntree's 47th birthday

Happy 47th Birthday to Mr. Dave Rowntree of Blur, The Ailerons, Gorillaz (contributor - drums) and politician fame. 

 Here's a funny Q&A I found online from here:

• When is Dave Rowntree's birthday?
• Dave Rowntree's birthday is April 8th, 1964.
• What is Dave Rowntree's horoscope/astrology sign?
• Dave Rowntree's astrology/horoscope sign is Aries.
• How old is Dave Rowntree?
• Dave Rowntree is 47 years old.*
• Dave Rowntree's Biography
• Dave Rowntree was born on April 8th, 1963. 
• (*if alive today)

What's with the last line ? Ha ha ha. [EDIT: 47, he's 47, not 48 years young. I must be posting one year in advance!]