How can I create a more user-friendly string.format syntax?

Question

I need to create a very long string in a program, and have been using String.Format. The problem I am facing is keeping track of all the numbers when you have more than 8-10

Answer 1

What about if age/name is an variable in your application. So you would need a sort syntax to make it almost unique like {age_1}?

If you have trouble with 8-10 parameters: why don't use

"You are " + age + " years old and your last name is " + name + "