I saw some reruns when I was young, same with Gilligan's Island, Bewitched, ChiPs, Welcome Back Kotter, The Brady Bunch, and others. For me, the time period or setting isn't what makes it hard to relate. It might depend more on the lifestyles or situations involved. Stuff like Leave It to Beaver, for example--the experiences are very different from mine. Or The Goonies. I found the pirate ship and secret world interesting. But, a big group of friends and running around with people for that long? Not for me.
Still, those are just obstacles or reasons why I may not care for the story. I could still relate to the emotions of the characters, if not necessarily what caused them. But, art can be useful that way.