You can run bitcoin on a raspberry pi so a 10 year old computer is just fine. Maybe check out some of the simpler implementations like start9, umbrel or Parmanode nostr:nprofile1qqs044j5pj8jl54pdgjapkpdm9wnhttcjr2rt5tfppy2pfma9zp6g3cpremhxue69uhkummnw3ez6ur4vgh8wetvd3hhyer9wghxuet59uqjvamnwvaz7tmwdaehgu3dwfjkccte9ecxs6tvd9cxxunfwd6xjctwduhxxmmd9ufzexy4