Over 70 Years
If you want an example, let us redirect you to Prince Philip and the Queen. They almost never touch in public, but they are still happily together seven decades later. We do not need more evidence than this!
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The Kids Included
It might not be all that common for them to be touchy, but does the same thing apply to parents and kids? While it is not always the same, parents do not get too affectionate with their little ones either.