Unfortunately, nature - as ever - doesn't care about causing offence.
At the very highest creative level, maths - like pop music and physics - is a young person's game.
* The general population, but also academics, take increasingly more time to mature.
* The body of knowledge grows and mastering it takes more time.
* People (at least the privileged elites) spend more time taking care of their mental and physical health. For example, we see that athletes competing in team sports on top level may reach their peak in their mid-30ies, which is a relatively recent development. If one translates this to math (I know it is a shaky assumption, but why not speculate) and peak creativity is reached in the mid-30ies, the papers that result from it may be published years later.
* In some decades, people will most likely frequently use software tools as helpers.
Not that I think that these developments change things completely, but I would expect that we will see a substantial shift.