Differences in relationships

[Aquarius]

Here's a topic that I often think about.
How much difference can a relationship cope with?

Be it difference in wealth (poor/rich), career (jobless / successful), age (young / old), looks (fat / model type), lifestyle (untattooed / covered in ink), experience (virgin / "slut"), height (short / tall), politics (leftwing/rightwing), religiosity (atheist / believer), etc...

how much of a difference can a relationship take? How much similarity is needed to stand a chance?

I'm asking because I'm very different to the "norm" in many regards, so this topic is quite often in my head.
If you know of examples where there are vast differences, it would be great to hear about it.

Not asking it to feel better, I quite had a lot of insight in the past months, but would still be interesting to read about unsimilar couples.