The DUXAP3 gene (DUX A Pseudogene 3) is classified as a pseudogene within the DUXA homeobox gene family. This gene is particularly interesting due to its putative roles, the biology of homeobox genes, and their significance in development. Below are more detailed insights related to your requests.

### 1. Associated Genes
While specific interactions or associations with the DUXAP3 gene may not be well defined given that it is categorized as a pseudogene, it is closely related to other genes in the DUXA family, including:
- **DUX** (DUX4): Known for its role in embryonic development and its association with facioscapulohumeral muscular dystrophy (FSHD).
- **DUXA**: Another member of the DUX family that plays a critical role in early embryogenesis and is expressed in early pre-implantation embryos.

### 2. Aging and Age-Related Diseases
As of my last update in October 2023, there is limited direct evidence associating DUXAP3 with aging or age-related diseases. However, homeobox genes, in general, can play roles in cellular differentiation and development, and misregulation often leads to developmental disorders or cancers as organisms age. Research on the specific roles of pseudogenes like DUXAP3 in age-related processes is still an emerging field and may not yet have clear conclusions.

### 3. Drug Interactions
Currently, there are no specific drugs or drug classes mentioned in literature that directly target the DUXAP3 gene due to its classification as a pseudogene. However, it is advisable to monitor ongoing research, as the functional implications of pseudogenes in disease processes and their potential as therapeutic targets are under extensive investigation.

### 4. Pathways and Biological Processes
DUXAP3, while being a pseudogene, may still be indirectly involved in several biological pathways and processes through regulatory networks associated with the DUXA homeobox genes, which encompass:
- **Transcriptional regulation**: Homeobox genes usually regulate the expression of other genes during development.
- **Cell differentiation**: They typically play a role in determining the fate of cells during the early stages of embryogenesis.
- **Pluripotency**: DUX genes have been implicated in maintaining stem cell states and pluripotency.

### Summary
In summary, the DUXAP3 gene is part of the DUXA homeobox family of genes, potentially contributing to developmental processes, although its status as a pseudogene limits our understanding of its functional significance. More research is needed to elucidate its role, especially concerning aging, drug interactions, and specific biological pathways. As displays of emerging evidence about the functional significance of pseudogenes develop, the understanding of DUXAP3 may evolve significantly.