The CDH12P3 gene is a pseudogene associated with the cadherin superfamily, particularly cadherin 12, which is implicated in cell adhesion and related processes. Since it is a pseudogene, it is generally not expected to encode a functional protein but may have regulatory roles or serve as a source of RNA.

### 1. Associated Genes:
While the CDH12P3 gene is itself a pseudogene, it may be associated with genes involved in similar pathways or biological processes. Notably, since it's related to cadherin family genes, it may be linked to other cadherin genes across the genome such as:
- **CDH12**: The functional counterpart of CDH12P3, known for being involved in neural functions.
- **CDH1**: Another member of the cadherin family, involved in epithelial-to-mesenchymal transition.
- **CDH11**: Associated with extracellular matrix and skeletal development.

### 2. Aging and Age-Related Diseases:
While there may not be a direct, established link between CDH12P3 and aging or age-related diseases, cadherin family members play roles in tissue architecture and cellular communication. Disruption in cadherin functions is often implicated in conditions related to aging such as:
- **Alzheimer's Disease**: Dysregulation of cell adhesion has been observed in neurodegenerative diseases.
- **Cancer**: Cadherin function is critical in maintaining cell-cell adhesion; its loss can lead to tumor progression and metastasis, processes that can be influenced by age-related factors.

### 3. Drug Interactions:
CDH12P3 being a pseudogene means it usually does not have clinically relevant interactions with drugs. However, due to its association with functional cadherin genes:
- Drugs targeting CDH12 or involved in modulating cell adhesion pathways (e.g., inhibitors of epithelial-to-mesenchymal transition) might impact the pathways wherein CDH12P3 is implicated, but specific drugs targeting CDH12P3 or direct interactions with it have not been clearly defined.

### 4. Pathways and Biological Processes:
Though CDH12P3 does not function as a traditional gene, its related gene, CDH12, participates in various biological pathways, including:
- **Cell Adhesion**: Involved in maintaining the integrity of tissue structure.
- **Wnt Signaling Pathway**: Cadherins can influence Wnt signaling, which is pertinent in development and cellular processes.
- **Neurodevelopment**: Given the role of cadherins in neuronal synapse formation and stability.
- **Epithelial-Mesenchymal Transition (EMT)**: Integral to various developmental and disease processes including fibrosis and cancer metastasis.

In summary, while CDH12P3 itself is a pseudogene lacking functional capacity, its associated pathways and related genes are crucial in understanding cellular processes, particularly regarding cell adhesion, neurodevelopment, and potential implications in aging and age-related diseases.