My daughter is 6, so not yet at the age where she is too worried about what is "geeky", thank goodness!
We have started a collection, in a stock book. Its a child-friendly stock book with a bright cover of colourful stamps of the world.
We have started country by country, choosing countries with which we have a connection to do first. For each country, I look out some stamps from my own ww collection and/or dupes. Then we make a page up in the stock book, aiming for each country to have a postcard or cover, a stamp showing its flag, and one showing its king/queen or president, then a representative mix of general stamps.
She has an enquiring mind, and loves to learn, especially about the flora and fauna of each country. But she is only six, and her attention span is short.
Her school does a lot of topic-based learning, so I try to find a few stamps for her to take for "show and tell" on whatever topic they are studying. At the moment they are learning about Malawi, and as my collection yielded very little, I took a quick look at
ebay and spent a few pounds on an album page of stamps and a couple of wildlife minisheets.
I think the key is to go with their interests and keep it relevent to them. Most of us began collecting as kids, I'm sure we can remember the excitement of filling our albums with tiny pictures - the learning came later.
The last thing I want is for it to become a chore or another homework type task she feels she has to do.
We have a little side collection going of stamps and covers with her name on. A very kind SCF member also sent her some postcards of his hometown of Charlotte, which she absolutely loved! I will be searching for something from the Queen Charlotte Islands for a Christmas present, I think!