At what age did your kids stop drinking from a bottle?

I babysit my friend’s two kids, ages 2 and a half and 7 and a half. I’ve been babysitting them for almost 9 months now and will for two more weeks until my due date is closer (I’m currently 36 weeks pregnant). So the 2 and a half year old still drinks milk from a bottle and will drink several a day. I personally think that’s way too old to still be giving a child a bottle but I haven’t had any other kids besides the one I’m pregnant with🤷🏼‍♀️