I have some makeup, all very natural. My 9yo is very interested in it. She will try on my (very natural) foundation, setting powder, lip balm etc. I can tell she has it on but it's so natural and she does a good job so most people would not know she was wearing it. She likes the routine of cleansing at night too. She uses my simple cleanser.
I only allow her to wear it in the house, I would not allow it at school/parties etc. I always tell her she does not need any makeup, she is so beautiful naturally inside and out. I always talk about how it's important to be a kind person and how you are as a person is so much more important than how you look etc. She has asked when she can wear makeup out of the house and I said maybe 13. I do allow a bit of nail varnish and some lip gloss now. She has a couple of friends who do wear some makeup now when going to birthday parties. Sometimes they talk about skincare together and she has mentioned brands like drunk elephant etc. I have said she doesn't need that and it's not suitable for her age.
So am I unreasonable letting her use my makeup? I don't mind too much and she is very careful with it. She enjoys organising it for me too and is very excited when I get something new to try it out. She does have some kids makeup of her own but prefers to use mine as she says it's more natural.