Rowan, no offence taken at all -- thanks for answering. You wouldn't see me breastfeeding my 2-1/2 year old as we keep it our dirty secret (joke) and I guess if you ever do see it, it's very, very unusual, heightening your sense of unease.
I hold my hand up to having made bitty comments to my husband when I was pregnant with my first on holiday in Asia and saw a 5 year old nurse (I can't explain why I don't like that word! We all have hang ups!)
I wasn't even intending to feed beyond a few months before I had her, but when she came, 5 weeks early and so tiny I fed and fed and before I knew it a year had passed, then 18 months, she was dependent on it for sleep etc etc, then we kind of just carried on. Hardly does it now, but know she'll want to when this baby comes.
My 2-1/2 year old talks about feeding her brother or sister all the time.
Hard not to mimic or not talk about something you've done for hours and hours and hours for months, even years, on end.