Kids of different ages could have different ideas. The important thing is to listen to what they might do and suggest some ideas of your own. Maybe they can cut down on the water bill by taking quicker showers or cutting back costs on gas for the car by consolidating trips.

It’s possible they come up with an idea of their own that you might have never thought of and is quite good. Their idea could also be to not cut down on bills, but bring in additional income and how they might help do that. Whatever it is, listen and work with their ideas.