Ledged wooden door (Llanbister)

Very old pine door 68 x 29 3/4 inches. Evidence of woodworm but don't know whether it's still alive so advise treating. It is unpainted although possible very ancient varnish and is absolutely dry having been in the attic for up to 150 years! I have what is probably the original antique Suffolk latch, of the type where the latch guide and received are spiked and hammered in rather than screwed.