Back in my day the only planets we knew of were the ones in our solar system.
That's still very much the case. All planets are, by definition, in our solar system. Any planet-like bodies not in our solar system are called exo-planets.
You make it sound like exoplanets are not planets, but they are, unless you have a recent source that contradicts my education.
Sure, how about this https://www.dictionary.com/e/exoplanets-and-planets-the-truth-is-out-there/
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Back in my day the only planets we knew of were the ones in our solar system.
That's still very much the case. All planets are, by definition, in our solar system. Any planet-like bodies not in our solar system are called exo-planets.
You make it sound like exoplanets are not planets, but they are, unless you have a recent source that contradicts my education.
Sure, how about this https://www.dictionary.com/e/exoplanets-and-planets-the-truth-is-out-there/