The CPXM2 gene (carboxypeptidase X (M14 family), member 2) encodes a protein believed to have metallocarboxypeptidase activity, playing a role in peptide metabolism and protein processing, particularly in the extracellular space. Here’s a more detailed overview addressing your specific requests:

### 1. Associated Genes
CPXM2 may show differential expression or interactions with several other genes, though the specifics can vary based on the cellular context and the associated studies. Some genes that have been mentioned in the broader context of carboxypeptidases or could be functionally related may include:

- **CPX** (Carboxypeptidase X)
- **M14 family members** such as **CPXM1** (carboxypeptidase X, M14 family member 1).
- **ADAMs** (A Disintegrin and Metalloproteinase), as certain members may interact in extracellular protein processing.

A comprehensive exploration of gene co-expression databases or interaction networks may reveal further associations.

### 2. Aging and Age-related Diseases
While direct studies specific to CPXM2 and its role in aging or age-related diseases may be limited, gene functions related to protein processing and metabolism can significantly impact various pathways linked to aging. 

- **Existing Correlations**: Enzymes like CPXM2 might be linked to age-related diseases through their roles in extracellular matrix remodeling, which is critical in tissue repair and aging.
- **Potential Links**: Research focusing on metalloproteases and carboxypeptidases indicates that dysregulation could contribute to conditions like arthritis, sarcopenia, or other degenerative diseases as observed with aging.

### 3. Drug or Drug Classes
Currently, specific drugs or drug classes interacting directly with CPXM2 may not be well-documented. However, drugs affecting general proteolytic processes or that target the extracellular matrix might indirectly relate to its activity. 

- **Protease Inhibitors**: Certain classes of protease inhibitors used in various pathologies (like HIV treatment or cancer) might have implications in regulating CPXM2 indirectly.
- **Investigational Therapeutics**: Given the potential role of CPXM2 in various metabolic processes, any investigational therapeutics aimed at metabolic disorders could be studied for relevant interactions.

### 4. Pathways and Biological Processes
CPXM2 is predicted to be involved in a variety of biological pathways and processes, including:

- **Peptide Metabolic Process**: Functions in processing and metabolism of peptide substrates.
- **Protein Processing**: Associated with the maturation of proteins and peptides.
- **Extracellular Matrix Organization**: May be involved in remodeling extracellular structures.
- **Cellular Signaling**: Could play a role in cellular signaling pathways through modulation of protein interactions.

**Key Pathways** might include:

- Proteolytic processing pathways
- ECM-receptor interaction pathways
- Immune response pathways, given its potential role in cell-cell interactions.

### Conclusion
The CPXM2 gene is involved in crucial metabolic processes and holds potential connections to aging and cellular function, although specific studies exploring such connections and pharmaceutical interactions might still be emerging. Further research into its functional roles and associations in disease contexts will be valuable in elucidating its importance in human health and pathology.