Thank you! 💛
Demons are immortal, so they can live very long if they're lucky. I haven't set specific ages for them, but Vez was already older than 50 years when they got a child, so Vez is around 100 years old now, Laz is similar in age with them, O is around 50, and Ash & Az are a bit younger. The MC is at least 30 years old.
They're adults but not very old by demonic standards.
I hope it answers your question!