Hi Ed:

If the site has been around for years, I hope you know someone with website experience to keep things on an even keel. I would be concerned about outdated software/firmware and the primary operating system involved. If money is collected/transferred or managed via the site, be extra careful. Tons of scams and bad actors lurking about, stealing personal information and looking for "phishing" targets. The knowledge and experience of your "user base" can make or break things very quickly.

Best of luck.