I prefer the sexy older-sister type and older.
The sexy older-sister type, every time — I like a woman who has already followed the identity tutorial and knows what she wants, so that we can avoid drama and move straight to chemistry, to a good conversation, and to mutually respectful independence. Younger and adorable generally brings more learning, more volatility, and a power imbalance; I don't want to raise someone, I want an equal who can keep up with me and push me to rise to the challenge from time to time with a smile.