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@BrickMan
Living in an old but well built flat with zero leaks or water ingress it sits around 35-50% RH in summer, 50-65% in winter. Above 65% RH I'd call a bit wet feeling, but would say thats normal to see in a bathroom or utility room most of the time.
Mates live in an even older and even better built flat, its 35-45% RH year round, almost makes your eyeballs itch in there (electric convector heating probably a contributing factor).
Have family living in a 3-400 year old scottish croft which has a badly poured concrete slab (1970's DIY job) with a wrecked membrane in it, above 70% all the time, have to run dehumidifiers in various places around the house to keep it from mildew forming in places with low air circulation. Only way to fix it is to remove the entire floor slab and replace, then do something with the 3-400 year old rubble walls to stop moisture climbing them. Has a very well built french drain + other water mitigation around it.
Most of October and November this year has been moist as hell, Glasgow has been 80%+ the whole time, everything is damp and sodden but weirdly warm.