What do I need to consider about secondary LASIK surgeries in my later years?

I assume that your question is referring to an enhancement procedure (either for regression of power or the onset of presbyopia) depends on the safety of performing such a procedure.

1. Ensuring that no other ocular pathology exists (including senile cataract), that would benefit from a different procedure
2. Sufficient corneal tissue is present (for further enhancement)
3. Appropriate target refraction is chosen for an appropriate reading distance (most important if monovision is desired to be spectacle free for both distance and near reading)
4. Whether an adjuvant procedure including collagen cross-linking is indicated.