Hi, I'm having a pretty simple (I hope) problem, but I just can't figure it out.

I need to combine several variables into one string. For example if I have
Code:
string name = "Joe";
int age = 55;

string description;
I want to arrange it so that description = "Joe: 55".

The best solutions I could come up with are
Code:
description = name ": " age;
and
description = name + ": " + age;
and neither of those work at all. What should I do?