Life prepares us for death whether we prepare or not. One way it does so is by weaning us of any over-estimation of the significance of the things of this world. For this weaning to take effect, however, one must take care to grow old. Disillusionment takes time. The passage of time, and plenty of it, will reliably reduce both the number of things that matter and the degree of the mattering of those that remain to matter.
Ageing may therefore be recommended as a way to wisdom, though it be a narrow gate thereto, trodden by few, the rest serving to show that there is no fool like an old fool.
The old saw that age brings wisdom is resisted by Susan Jacoby. I resist her resistance.