Saturn return
Saturn takes about 29 years to come back to its natal place. The first return, near age 29, is adulthood's real threshold: structures that do not fit get pruned, and what remains is yours.
Saturn orbits the Sun in roughly 29 and a half years, so around ages 28 to 30, and again near 58 to 60, it returns to the degree it held at your birth. Retrograde motion usually turns each return into several exact passes across a year or so, and the surrounding stretch, two years and more, is the return in the lived sense.
No landmark in astrology has broader agreement. The first Saturn return is read as the true threshold of adulthood: a season when commitments, careers, and self-images built to someone else's specifications stop fitting, and structures that cannot bear weight come down. It can feel like fate arriving from outside. The tradition's counsel is that it is closer to an audit of your own foundations, and that whatever survives it, or gets built during it, tends to last.
The second return, near sixty, opens elderhood on the same terms, and the writers on aging add a pointed observation: it goes hardest for those who refused the first one.
The dates themselves are pure astronomy and need only a birth date. The cycles page computes yours, alongside the other appointments every chart keeps.