You’ll be golden. They’re usually people who walk most of it, people with kids, etc. Parkrun say that they pride themselves on the average time getting slower the more people join, as they’re all about inclusion.
It’s a lot of fun, and it’s just a race against yourself, and you’ll (hopefully) have a nice glow of a job done afterwards.
Which one? Hove lawns or Hove Park? Loads of people walk, and last year they were making Park Walk more of a thing. I’ll be back on it in April, after a break of far too long, so maybe I’ll join you on Hove Lawns one day - that’s a lovely one, nice and flat and right on the sea front