Tallu gets glimpses of the boobies-formerly-known-as-milkies, and wants to touch them. I refuse, but I tell her she can say hi. She waves to my chest and says "Hi, boobies!" Or I'll ask if she wants the boobies to give her a hug, and I'll give her an extra squeezy hug. No doubt she remembers nursing rather fondly, and I do, too. I always wondered if she was getting enough, if we were going on for too long, if she would ever stop. She was getting comfort and nourishment, it went for as long as she needed it to, and yes, she stopped nursing.
It would be so helpful to nursing mothers to receive encouragement and support for this decision. You may think that nursing a toddler who can say "I want booby" is too old. You're allowed to your opinion, but that's when you press the Interior Monologue button. You may see a mother nursing her infant on a park bench, shirt up, "shame" be damned. Babies need to eat, and they don't care that they're in the park. Keep walking, and let that mother care for her child. You'll be glad when that same baby is sleeping soundly, not wailing for dear life on the train. If your family is unfamiliar with nursing, there's no better way to introduce them to it by not hiding. My aunt, who recoiled dramatically and hilariously the first time I nursed Tallu, praised me for nursing her great-aunt/godchild for so long when I told her we were finished.