Sorry i forgot to reply, no it does't make you a senior or junior. There's tonnes of other factors that make you a senior other than being able to code or explain something (sure those are very important) but seniors take into consideration the business, the team and seniors are those who get things done when others can't in a better way.
No need to remember what OOPs definition is, but as long as you understand it well enough to explain it with your own words thats all that matters!
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