My Dad has the voiceover on his telly, where he can...something he got used to from when my Mother used it because of her not being able to see....I find it really annoying, but understand his liking for it.
I kind of fall into the former age group for using subtitles....I don't use them though...not so much because I don't need them, but because more often than not the actions on the tv move quicker than the subtitles appear ....I'm not beyond being confused easily
The speed of the subtitling will be slower on live programmes compared to recorded programmes as the subtitler is having to catch up when it's live.
My next door neighbour is elderly and has her television on at varying volumes which can be low, loud or loud enough for me to be able to hear throughout my house (semi-detached), So if I watch television I have to put in ear plugs to lessen the sound from her television and watch using subtitles. Recorded programmes don't always have subtitles and there was a film which did but for some reason there was a gap of several minutes between the film and the subtitles.
The neighbour uses television as her only activity. She has one upstairs and one downstairs. She can have the television on virtually the whole time from when she wakes up to when she goes to sleep. As she is totally reliant on that, I don't have words with her about the volume. I think she can't tell the difference in the volume.
At present her television is relatively quiet, it won't stay like that.