What about your daughter - you should both be riding together. Get yourself one from the flea market and get her one of the colour of her choice from the LBS.

Start your tours with weekend tours, gradually build up to 3 month tours. Then you can make the decision about the real long stuff. When you are fit enough to do a 5 yr tour she will be strong enough. What will happen to her schooling. Do it do she will enjoy this extended touring.