Concatenate Integer and integer

Hello everyone. How do I concatenate an integer variable and a number so that the output is a combination of the two?

I.e my code is

Int age =5;

FlatButton(
onPressed: (){
setState((){
age & 6;
);
});
},
and I would like to output 56 from the above code.

setState(() {
 age = int.parse("$age6");
})
3 Likes