Memory Game Plus doesn't have an age limit, it's a card pairing game for kids and adults alike. Memory is like a muscle, the more you practice the better it gets. That's why it's important to play memory games, especially for kids since it improves the short-term memory. While it's casual and educational, it is also challenging and fun.
Here's an overview of its main features:
"Memory Game Plus" is available for free from Google Play and you see it in action here: https://www.youtube.com/watch?v=_jEsnhgXRD0