*Surely the 'finkers' watch tv, listen to radio - where people are mainly speaking with a th and f correctly. Some having American etc accents.
Seems odd that someone's experience is so restricted to a certain accent that you can't speak differently if you want*
I am in my 40’s. The access to tv and radio to the extent we have now is relatively recent. In my youth we had 3 channels. Very little kids tv, so again that key childhood development phase we watched at most half an hour a day. The rest was boring adult stuff we didn’t pay much attention to.
Much of it was also regional. Itv for ages was more like local radio. Radio itself was only really listened to in the car or at home- they weren’t portable.
I moved around a lot as a kid. My parents weren’t local to the areas I grew up in, and neither were they local to the the area their parents grew up in. So I heard everything from irish to northeastern to brummie to RP. I have an “ear” for accents and can mimic and pinpoint to regions fairly easily.
Dh on the other hand comes from a family that has been in S London for generations. Everyone in has family has the same accent. As did his school friends and nearly everyone he met for 30 odd years. He hasn’t developed that ear for the different sounds.
This and future generations may be different with easy access to tv from all over the world. In fact my own kids, despite growing up in S London have neutral accents as their school was very multicultural and everyone had a different accent.