Venues which are converted cinemas, theatres and music halls tend to be fine.
Decent sightlines, usually decent acoustics, and crowds measured in hundreds, maybe thousands.
In the last year, I've been to gigs at Koko, The Forum, Shepherds Bush Empire, Hammersmith Odeon (I know, I know) ... all absolutely fine.
The moment you go supersize and industrial (Earl's Court, O2, NEC) and the crowd is measured in tens of thousands, the whole dynamic changes for the worse.
I wouldn't want to give up going to gigs, even at my age.
Happy as I am to blast out Piledriver on my stereo at high volume, it's not the same as singing along to [i][b]Don't Waste My Time[/b][/i] with 3500 other Quo fans at the Odeon.