The Telegraph has written an article on Eastbourne. I have included the link to it below.https://www.telegraph.co.uk/news/2020/04/10/postcards-lockdown-britains-oldest-town-coping-coronavirus/?fbclid=IwAR3cxmIfelJqXWg-EGEnYPqAmonY51zgBPHvyp1yWTGP5DIVpZMAWG9QbDM
I am not sure how accurate it is, as in the most recent articles I could find, Eastbourne isn't even in the top 10 oldest towns and cities. Blackpool had the oldest population in 2018
https://www.bbc.co.uk/news/uk-43316697
Very interesting and informative