What if we could program senescence as a reversible, controllable state rather than an endpoint?

This question frames a direction I'm exploring: what mechanisms might allow us to decouple chronological time from biological dysfunction?
The hypothesis: the answer lies not in preventing damage, but in understanding why damage response pathways fail progressively with age—and how we might restore their youthful competence without rewinding the clock entirely.
What experimental approaches would best test this framing?