Very true - that's because we haven't seen the same level of London migration as Brighton, plus of course a lot of people originally from Brighton have been forced out as the cost of living rose
I lived in Shoreham for the first 25 years of the life, with a couple of stays in Southsea / Portsmouth whilst at Uni. Since 25 I've lived in Worthing and I love the place. When I first moved here, all of 23 years ago, it was a quiet place, clean and tidy, but with a large ageing population...