The XRCC6P3 gene, also known as X-ray repair cross-complementing protein 6 pseudogene 3, is a pseudogene located on chromosome 2. It is a member of the XRCC6 gene family, which is involved in DNA repair processes, particularly in the non-homologous end joining (NHEJ) pathway. The XRCC6 gene, also known as Ku70, codes for a protein that plays a crucial role in DNA double-strand break repair.

### 1. Associated Genes
While XRCC6P3 itself is a pseudogene and does not have an active function, it is closely related to the functional XRCC6 gene. Other genes associated with XRCC6 may include:
- **XRCC5** (Ku86): Works alongside XRCC6 in the NHEJ DNA repair process.
- **DNA-PKcs (DNA-dependent protein kinase, catalytic subunit):** A component of the DNA-PK complex involved in the NHEJ pathway.

### 2. Aging and Age-Related Diseases
As a pseudogene, XRCC6P3 is not directly implicated in aging or age-related diseases. However, the functional XRCC6 gene is essential for maintaining genomic stability, which has implications for cellular aging and cancer susceptibility. Accumulation of DNA damage due to ineffective repair mechanisms is associated with age-related diseases, including neurodegenerative disorders and certain cancers.

### 3. Drug Interactions
Currently, there are no specific drugs or drug classes directly known to interact with the XRCC6P3 pseudogene due to its non-coding status. However, drugs that target the DNA repair pathways involving its functional counterpart, XRCC6 (Ku70), may indirectly relate to the processes where XRCC6P3 is involved. Chemotherapeutic agents that induce DNA damage, such as:
- **Doxorubicin**
- **Cisplatin**
These agents act on the machinery of DNA repair, where interactions might alter the expression of genes related to the XRCC6 family.

### 4. Pathways and Biological Processes
XRCC6, the functional gene, is involved in several important biological processes and pathways that could relate to XRCC6P3:
- **Non-Homologous End Joining (NHEJ):** Involved in the repair of double-strand breaks in DNA.
- **DNA Damage Response:** Participates in cellular mechanisms that respond to DNA damage.
- **Cellular Response to DNA Damage Stimulus:** Important for maintaining genomic integrity following DNA damage.

### Summary
Although XRCC6P3 is a pseudogene and lacks a direct functional role, it is associated with important genes involved in DNA repair and is related to pathways that protect against genomic instability, a significant factor in aging and age-related diseases. The context of drugs and interactions is more routed to its functional relatives involved in therapeutic contexts.