No, irreparable damage. Note that what is irreparable depends on level of technology.
Examples of potentially irreparable damage: DNA damage, oxidative damage, toxin accumulation, damage to extracellular matrix, scarring, changes in gene activity, and more.
Note: Your cell line has lived for about 3,600,000,000 years. The trick to living 3,600,000,000 years is to repair damage faster than it occurs, for example by reproducing cells at sufficient rate that new undamaged material is created faster than damage accumulates.