[R] Doubt in simple merge

[kingsly]

Dear R community

I have a two data set called "Elder" and "Younger".
This is my code for simple merge.

Elder <- data.frame(
  ID=c("ID1","ID2","ID3"),
  age=c(38,35,31))
Younger <- data.frame(
  ID=c("ID4","ID5","ID3"),
  age=c(29,21,31))

mer <- merge(Elder,Younger,by="ID", all=T)

Output I am expecting:

ID    age
ID1  38
ID2  35
ID3  31
ID4  29
ID5  21

It looks very simple.  But I need help.  
When I run the code it gives me age.x and age.y.
thank you




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