Midlife is an interesting time.
On the one hand it's going to get easier now, it's all downhill from here. On the other hand, even going downhill can start to hurt the creaky old knees. After the hustle-bustle of courting, the toil and strife of marriage, and the wonderous and challenging experience of parenting, coupled with carving and maintaining a career, and paying for all the things which need paying for, many people find simple nudity a particularly relaxing experience. Exploring being naked in a private or a public space, depending on both your inclinations and your opportunities, can be a great leveller for any age group, perhaps it just comes a little more naturally to the slightly wider in the middle set, or perhaps it's a result of being simply a bit less stressed. We realize, finally perhaps, that there are, after all, more important things to worry about.
Never mind that we're not having to impress the other (?) sex with our smart clothes and earning/mating potential, now we can relax and just enjoy the simpler pleasures in life. Happily, we find it's cheaper too, getting through less clothing, using less washing powder and cleaning chemicals, and bound with this of course there's the extra pleasant fuzzy feeling from the self-satisfied knowledge that the lifestyle is more environmentally friendly, too. And, for those who do not come from life-long nudist families, perhaps a change is as good as a rest.
Crisis? What crisis?