I don’t want to BE younger. The progression of time facilitates wonderful things. You fall in love over time. You build relationships with your kids as years march on. You get better at things by practicing for weeks, months, years.
The bummer is that the culmination of it all is death. And a constant reminder of that unavoidable end is the face’s deterioration. Perhaps that’s why society so values youth, despite its lack of skills, maturity and experience.
If you appear youthful, but have the experience and maturity of an elder, maybe you’ve beat the system? Well, no. You will still die. But you can live in blissful denial for a bit.