I'm carded for R-rated movies. And I get talked down to a lot. When I try to go rent a car or buy an airplane ticket or other stuff adults do I get 'Okaaaaaay honey.' I remember when I was 18 getting crayons in a restaurant.
If I have enough ego to say I'm a writer a director a producer and an actor I should have the energy and the knowledge to write a scene for this great actor named Henry Fonda and direct him in it and have it work.