Note: I am not asking about the oldest anime series. I am talking about "original anime series" i.e. anime series not adapted/based from manga/LN/VN/games but an original story that went straight into animation and then to the general public.
From my knowledge, the earliest I know is Mobile Suit Gundam (1979-80) which makes it approxiamtely 41 years old. Are there any original anime series older than Mobile Suit Gundam?