I have an old 7.65mm Luger that has been in my family since the 1920s. The first time I fired it was back in about 2005. Before that, the pistol hadn't been fired since the 1950s, and had been tucked away in my dad's bedroom closet for years and years. When we took it out and shot it, I had no problems with it, except that I was limpwristing and we found out that this was what was causing the pistol to jam. Other than that, there was nothing wrong with it at all.
You should not have any problems if you decide to fire yours again.