Just as an aside, children vary hugely in their maturity and ability to cope so in the first instance, I'd be guided by the child. My older daughter, when primary school age, was always quite anxious about going on school trips especially if it involved overnight stays. My younger daughter was the pole opposite, came home with a PGL brochure aged 7 and asked to go on one of the holidays. She did one as a 7 year old and one at 8, completely on her own and didn't even phone home. She had a fabulous time and tbh I didn't worry about her as I knew she'd be fine.