Search for words and change format

So basically i have a file with a lot of names and ages and other unnecessary stuff with this kind of format:

Name: Example
Age: 20
Hobbies: Blahblah
Other stuff: jashdjahsdj

And i want to grab the name and the age of every single person in the file and reformat it to something like this:

Name-Age

I'm really new to this so any help would be appreciated.

Thanks in advanced