[R] how to replace values

[kingsly]

Dear R community
 
I have a large data set contain some empty cells. Because of that,  may be I 
am wrong, <NA> values are produced.
Now I want replace both empty and <NA> values with zero.
 
Elder1 <- data.frame(
  ID=c("ID1","ID2","ID3","ID6","ID8"),
  age=c(38,35,"",NA,NA))
Output I am expecting
 
ID   age
ID1  38
ID2  35
ID3  0
ID6  0
ID8  0
 
In advance I thank your help.



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