The GEMIN8P3 gene is a pseudogene associated with the GEMIN8 gene, which is known for its role in pre-mRNA splicing and the formation of spliceosomal complexes. Below, I’ll provide a more detailed overview concerning your specific queries.

### 1. Associated Genes
GEMIN8P3 is a pseudogene, meaning it does not typically produce a functional protein. However, it can be associated with genes involved in similar pathways or functions, particularly those related to mRNA splicing and regulation. Other genes that may be associated or have functional similarities include:
- **GEMIN8**: The primary gene that shares sequence homology with GEMIN8P3.
- **SMN1** and **SMN2**: These genes are also involved in the spliceosome machinery and are known for their role in spinal muscular atrophy.
- **SNRNP proteins**: These proteins participate in spliceosome assembly and function.

### 2. Aging and Age-Related Diseases
Currently, there is limited direct information on GEMIN8P3 and its relationship to aging or age-related diseases. However, given its association with GEMIN8, which interacts with the survival motor neuron (SMN) complex, there may be implications regarding neurodegenerative disorders like spinal muscular atrophy or amyotrophic lateral sclerosis (ALS). Alterations in splicing mechanisms can be linked to various age-related diseases, though the specific role of GEMIN8P3 remains largely unexplored.

### 3. Drug Interactions
As a pseudogene, GEMIN8P3 does not typically produce a functional protein and therefore isn't directly targeted by drugs. However, drugs that target the GEMIN8 or SMN complex may indirectly relate to the pathways in which GEMIN8P3 is involved. Potential classes of drugs influencing the SMN complex include small molecules aimed at enhancing SMN expression, such as:
- **Nusinersen (Spinraza)**: An antisense oligonucleotide used in spinal muscular atrophy.
- **Risdiplam**: A small molecule that modifies SMN2 splicing.

### 4. Pathways and Biological Processes
GEMIN8P3, being a pseudogene, does not directly participate in biological pathways, but its associated gene (GEMIN8) is involved in several crucial biological processes and pathways, including:
- **mRNA Splicing**: GEMIN8 is a critical component of the spliceosomal complex, which is essential for the removal of introns from pre-mRNA.
- **Gene Expression Regulation**: It plays a role in maintaining proper gene expression through mRNA processing.
- **RNA Biogenesis**: GEMIN8 is involved in the formation and assembly of RNA granules and ribonucleoprotein complexes.

In summary, while GEMIN8P3 is primarily classified as a pseudogene with limited direct functional information, its association with GEMIN8 highlights its potential relevance in the broader context of mRNA processing, aging, and disease. Further research is necessary to fully elucidate its implications and roles within biological and pathological states.