The OSCP1 gene (Osteosarcoma-Associated Protein 1) is known for its role in transmembrane transport and xenobiotic detoxification processes, particularly in the context of placenta drug clearance. Here, I will provide detailed information considering your specific requests:

### 1. Associated Genes:
The OSCP1 gene may exhibit functional associations with several other genes involved in drug metabolism and transport. Notable associated genes include but may not be limited to:
- **ABCB1 (P-glycoprotein)**: A well-studied transporter involved in xenobiotic transport and drug efflux.
- **SLC family members (Sodium-Glucose Transporter, etc.)**: These genes often coexist in transport-related pathways.
- **CYP enzymes (Cytochrome P450 family)**: These are crucial for drug metabolism and may interact in pathways related to OSCP1.

### 2. Aging and Age-Related Diseases:
Research into the specific role of OSCP1 in aging or age-related diseases is limited. However, since it is involved in xenobiotic detoxification and drug clearance, it may have implications for the aging process related to:
- **Metabolism of medications**: As individuals age, the efficiency of drug metabolism changes, which can be related to the function of transport proteins like OSCP1.
- **Tissue responsiveness**: Changes in transport mechanisms may contribute to age-related decline in tissue sensitivity to drugs or toxins.

### 3. Known Drug Interactions:
OSCP1's role in xenobiotic detoxification suggests potential interactions with a range of drugs. While specific drug classes may not be distinctly listed, potential interactions could include:
- **Antihypertensive drugs**: The clearance of some antihypertensive medications may involve OSCP1.
- **Chemotherapeutics**: Certain chemotherapeutic agents may be modeled to gauge interactions and clearance rates influenced by OSCP1.
- **Modulators of metabolic pathways**: Interactions with drugs that alter hepatic metabolism or enhance elimination pathways could be linked to this transporter.

### 4. Pathways and Biological Processes:
OSCP1 is involved in various biological processes and pathways, including:
- **Xenobiotic Metabolism**: The gene plays a crucial role in the detoxification pathway for foreign compounds, facilitating their transmembrane export.
- **Drug Transport**: Related pathways involve transport across the plasma membrane, which is crucial for maintaining cellular homeostasis and influencing pharmacokinetics.
- **Placental Function**: Specific to its role in drug clearance within the placenta, OSCP1 influences maternal-fetal transfer of substances, impacting pharmacological outcomes during pregnancy.

### Conclusion:
OSCP1 gene plays a pivotal role in the transport and detoxification of xenobiotics, with implications in drug metabolism and potential impacts on aging and health outcomes. Further studies may elucidate specific interactions with drugs and therapeutic agents, and ongoing research may reveal more about its role in age-related biological processes.