Many games that were initially launched in the '70s have never gone away- they're still being made today, and remain as popular as ever. Also, some have been re-introduced in a 'retro' context after an absence of 20 years or more.
Two that have never left us are Connect 4 and Mouse Trap; Ker-Plunk and Twister have also reappeared after about two decades in the wilderness. Can anyone name any others?
(I would have included Cluedo as well, but just found out this actually came out in '65!!)