How old is too old to Put your child in a carrier?

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My daughter is two and I carry her in my back when she sleeps and we are in the go. She hates the carriage but is still too young to walk everywhere. My arms have had tendinitis from wrists to shoulders for picking her up as a baby. It seemed normal to others while I nursed but I still got stares from non nursing folk :( I now have met a mother at the park who carries her three year old in the back and one year old in the front. She is stronger than I am ...wow ! I say to her. When we go downtown, a back pack is so heavy and I can't imagine doing that everyday. A carriage is too hard to treck up and down the subway so the carrier helps. It carries up to 45 lbs. she is 35pounds already. I plan to go all the way until she beaks it down because it provides so much comfort and ease in life to us both. My back never hurts but my legs do get a workout if I do stairs! I lost 15 lbs during a real busy week in our life and I say it was due to the stress and walking around everywhere with her on my back. I'm still getting stares but I don't care, what do you think?