If you don't live in the UK and want to get the "feel" of the Marauders' childhood right, look up a show named "Back in Time for the Weekend" that's currently running Tuesdays on BBC 2. It's available
on YouTube in full-length episodes.
It's about a family of four who've agreed to live each past decade since the 1950s for a week, complete with furniture, fashion, food, entertainment, technology and general living conditions. It gets relevant for the Marauders (mainly Lily and Severus, and probably Remus) from the second episode onwards, the 1960s (linked above). #3 is obviously the 70s when they're at Hogwarts, and #4 is the 1980s, when they all left school and Harry was born. More to follow ...
It shows how Lily and Petunia would've grown up in a typical English middle-class family of the time, and the Snapes -- being poor -- might've stayed stuck half, or even a full, decade earlier ... and what they might have aspired to/envied their neighbors for.
It's definitely an interesting resource -- I mean, I was born in the 1950s, and don't remember half of all that stuff, despite having lived through it! And it's a much better, more realistic depiction of how it used to be than whatever version Hollywood cranked out at the time. Mrs Evans (or Eileen Snape, for that matter) sure as hell weren't Doris Day or June Cleaver!
There are also videos on YouTube for Christmas and typical dinners of half a century ago, also under the "back in time" tag. :-)
Enjoy!