Just wondering on whether suitable for a young 8 year old?

The game itself is rated 12. While the game play is suitable for younger players you should note that there is a chat feature that is active for the player to see chat from anyone in the state and if they join an alliance (which is the best way to progress in the game) there will be alliance chat as well. Most players are adults and the chat will likely reflect this.

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Yes, An 8 year old should be able to learn and play the game with no issues. An 8 year old will also learn more facts about Ants (If he/she is looking to become a Myrmecologist)

No, I wouldn't let my children use this game, I'd say 16+ due to the fact that they are able to play and talk with strangers, mostly adults.