How do I bring this issue up with our neighbours?

Tenko

Just mention politely that you can hear their TV through the walls. My mum lives in a retirement apartment complex and a few years ago she bumped into the neighbour above her. This neighbour mentioned that mums tv was quite loud . Mum hadn’t been wearing her hearing aids because they kept falling out .
So with your neighbours , it could be hearing issues .

I live in a retirement flats complex and the majority of residents have hard-of-hearing problems including the lady in the flat opposite who's TV is often pretty darn loud.

The complex manager told me that she has hearing aids but "won't bloody wear them even though her son paid a lot for them - she says he wasted his money and it's cheaper to turn the sound up. What can I do with someone who's just determined to be awkward?"

Indeed......

jakuss

I dont think many 80 year olds put a tele on the way, they are deaf and dont realise it

"put a tele on the way"?

At least you've mentioned it to your neighbours and all is still amicable. Next time you speak to them, maybe offer to set their TV up with permanent subtitles, they may not know how to do it or even that it is available. Otherwise, you may find that the volume gets louder again as time goes on.

My 100 year old mother-in-law bought a new TV and didn't want to put it on the wall.

She bought a great wooden swivelling TV stand for it so she could watch it easily wherever she chose to sit in her sitting/ dining room.

Thought I'd just share it here.
She loved it and she chose a colour that matched her Danish mid-century furniture.

I don’t think asking if yours is too loud is useful because if they are deaf they ll say ‘no it’s fine thanks’ 🤣
I hope your ‘easing in’ way has helped but sometimes you do have to be a bit more direct, while still being kind and considerate
‘I wonder if you can help me’ kinda line is not confrontational but puts the onus on them to offer changes and makes them feel they are doing you a favour, and that can go for anything an overgrown hedge , loud tv, car in wrong place, just anything I think it is a kind way of asking.