One of the most familiar phrases that we hear nowadays is "age is nothing but a number." It seems movie makers and film directors have taken this phrase too seriously, though. It may be true that in some cases, difference in age practically doesn’t matter at all, but what's also true is that it can be a little weird when the gap is so large that people cannot tell whether the duo is actually a couple or they have a family relationship... are they father and daughter? Mother and son? Sometimes it's really hard to tell. Let's check out some fictional couples with huge age differences.