Great seeing other older skiers that are still skiing recreational moguls for the exhilaration and fun, thanks for the link.
Would expect there are more 60+ older skiers out there still skiing rec moguls than most would expect and some are on this board. Thus would bet one can see a few at most long time resorts still moving smoothly through moguls where there are nearby larger mountain towns. That noted it is also true that there are significant percentages of older former competent mogul skiers that are otherwise still ski enthusiasts, that no longer ski bumps because they eventually damaged their knees or their bodies declined due to age related degenerative factors. That is probably more the case for those that focused on competition style mogul skiing because the speed and hucking air factors result in greater forces. Much also has to do with DNA of course.
If one does any potentially dangerous athletic activity long enough, the chances injuries may eventually occur have a way of happening as any gambler well knows. A reality in this mortal fleshly universe is all we skiers will eventually grow too old to ski as any centenarian can relate. But until that day arrives the wisdom of use it or lose it applies that can work to extend those years and the enjoyments of life. Beyond skiing I see surprising numbers of fit older mountain hikers and backpackers still out enjoying their game that uses similar body structures.