填空题

下列子过程的功能是：将当前数据库文件中“学生表”中的学生“年龄”都加1。请在程序空白处填写适当的语句，使程序实现所需的功能。
Private Sub SetAgePlus1_Click()
Dim db AS Dao．Database
Dim rs AS Dao．Recordset
Dim fd AS Dao．Field
Set db=CurrentDb()
Set rs=-db．OpenRecordset("学生表")
Set fd=rs.Fields("年龄")
Do While NOt rs.EOF
rs．Edit
fd=______
rs．Update
______
Loop
rs.Close
db.Close
Set rs=Nothing
Set db=Nothing
End Sub