In this episode, Carole asked how old Moses was when God appeared to him in the burning bush. I said I that I didn't think you could tell from the story in Exodus. And that's true. But the New Testament book of Acts claims to know. Here's what it says about it:
Moses ... was full forty years old [when] he ... smote the Egyptian. Acts 7:22-24
Then fled Moses [to] the land of Midian ... When forty years were expired, there appeared to him in the wilderness of mount Sinai an angel of the Lord in a flame of fire in a bush. Acts 7:29-30
So Moses was 80 years old when he met God in the burning bush. (Things are nearly always in intervals of 40 years in the Bible.)
The angel of God appeared to him (3:2)
God called out from the bush (v.4)
The is the first time Aaron is mentioned in the Bible. The story about Moses's birth and rescue didn't say anything about him. (His sister Miriam isn't mentioned by name either until Ex 15:20 - although presumably she was the sister who was involved in his rescue from the river.)