That is the type of windows we have. The house was built in the 1890s. The windows are made of pine or similar soft wood and I have no reason to believe any of them have ever been replaced.Around here the traditional type of double glazing is casement windows with the outer casement opening outwards and the inner casement opening inwards. Both casements are single glazed and together they form a double glazed unit when they sit in their own rebates in the jambs. Made from good quality pine theese windows normally last somewhere between 50 and 250 years if properly maintained all depending on how exposed the facade is to the weather.
Have you any knowledge of upgrading these windows? I have toyed with the idea of making replacement (outer?) casements to house 2 glass panes instead of 1, but have not tried it.