I have had a houseplant that my brother gave me over 25 years ago. It has only bloomed once about 12 years ago.
Your plant is called a Clivia Plant and it should bloom at least once a year (usually more). Keeping a Clivia Plant root-bound in a small pots helps it bloom. It is also important to give a Clivia Plant a rest for several months during the winter.
You can read my care tips for a Clivia Plant in the Popular HousePlant section of the website.