First person of Suju members who wish Kibum birthday was Heechul trough his twitter about an hour ago.
Heechul tweeted :
“오늘 내동생 양반김 김기범의 생일입니다. 처음 만났을때 기범이가 17살이었는데 벌써 25살.. 난 이제 서른ㅇ0ㅇ 형이 생일빵 못갈겨줘서 미안 Happy Birthday KiBum~ :)”
Trans:
Today is my brother’s birthday Yangban Kim Kim Kibum. At the last meeting there Kibum only 17 years old, now 25 years old .. I am now thirty ㅇ ㅇ 0 Hyung not throw a birthday cake for you, sorry. Happy Birthday Kibum ~:)

attached with their old photo.