Normally didn't buckle up especially at younger age, sitting with my siblings at the back seat. You know la, like to jump around in the back and look out of windows.
But after much growing up, and knowing the sheer dangers of not buckling up, it'd rather take the hassle of buckling up. Then again, some rear seat belts are notoriously hard to slot in properly, so I'd dice with lady luck and hope nothing untoward happens.