The answer is… when you no longer want to send them gifts. When it becomes a chore, its no longer being done in the usual spirit of gift giving and helps no one. Personally, I like sending small things I’ve 3d printed or otherwise made. my nephew and nieces will never be too old for flexi dinos.
spoilerThey may arrive slightly used. which is weird, because I’m obviously too old to play with dinos, right?