Honestly, breastfeeding, pacifiers, and bottles are as controversial as abortion it seems. The two subjects are very much on different levels of seriousness, but the controversy factor is the same. People either think it's right or wrong, with only a few exceptions.
I personally think that breastfeeding, bottles, and pacifiers are things that should be stopped at 1-1/2 years of age. BUT, I'll tell you why I think this. I truly believe that as a child approaches the age of two, they start to really latch on to material things for security. This is the age where they either learn to calm themselves down with little help from mom (I'm talking about those times when the crying is for no particular reason except for grumpiness), or they completely become reliant upon their bottle, binky, or mothers boob as a means to be calm. I believe that if you can wean them off of things around a year, there are no withdrawals from the objects. I personally weaned my kids off their "binky" at 6-9 months because at that point, they weren't "babies" anymore. And in my humble opinion, pacifiers were only meant to be used for newborns because their only natural instinct they have when they first are born is to suck. Pacifiers were definitely not initially invented to be sucked on by toddlers, and absolutely not for young children, but like I said, that's a personal opinion. I believe that parents use them as a "plug" once the child is past the baby phase, that's why I didn't use them after 6-9 months. And, if you are a mother of a child who sucks on a pacifier at the ages of 2 and up, just start watching and take notice of the times that they start to show signs of getting upset. You'll see very quickly that you are frantically searching for the binky when you're in a store and your child starts acting up. You tell your child to get their binky when you're at home and they seem tired or cranky. It's not hard to see what the real reason behind not wanting to get rid of the binky as a parent is. Trust me, it was an obstacle for me too, because at night when my baby woke up, I would always put the pacifier in their mouth and they'd go back to sleep. BUT, that's what I'm saying though, you and your child become reliant on something other than our own natural human instincts to calm them down. This is the most amazing learning part of their lives. I believed I owed it to my child to have them learn how to calm themselves down without the material things. My children never even took to a blanket or particular stuffed animal. They just weren't brought up to rely on anything but their own minds and my love to be calm downed with. Both their bottle and formula I took away at age 1, but like I said, it's because I wanted my child to not become dependent on it. Both of my children didn't cry for their bottle ONE TIME. That tells you that 1 just happens to be a good age to take things away without having your child (and you) suffer.
They're personal choices, as much of motherhood is, but you can't get mad at people's opinions, because they are just as mortified by other people's choices as those people are of theirs. So, do what you want to do, but remember that the longer you allow your child to be attached to something in particular, the harder it's going to be on you and your child to take it away later.