Same here, 40 years old (single, no kids) but I do keep clued on what kids are doing these days (via my niece and nephew) - never heard them issue come up either, I hazard to guess the whole status of owning an iPhone and iMessage has more to do with the socio-economic circles one moves in. With that being said, in New Zealand 53.94% use Android and 44.52% use iOS with most kids either using FB Messenger or WhatsApp which is probably why so few care about bubble colours.