The RNU2-15P gene is classified as a pseudogene and is part of the non-coding RNA (ncRNA) class, specifically related to the U2 small nuclear RNA (snRNA) family that is involved in pre-mRNA splicing. Here’s a detailed overview based on your request:

### 1. Associated Genes
While the RNU2-15P gene itself is primarily categorized as a pseudogene, it may have homology with other genes related to snRNA functions. Other genes in the U2 family related to splicing include:
- **RNU2-1**: A functional U2 snRNA involved in the splicing process.
- **RNU2-2** and **RNU2-3**: Additional U2 snRNA family genes that play roles in pre-mRNA splicing.
  
Any specific interactions with genes outside of the U2 family may not be well documented, as the gene is primarily a pseudogene without established functional implications.

### 2. Association with Aging or Age-Related Diseases
As a pseudogene, RNU2-15P does not have a documented direct role in aging or age-related diseases in the current literature available until October 2023. Generally, research on pseudogenes is still emerging, and while some may have regulatory roles or influence the expression of active genes, there is no concrete evidence linking RNU2-15P with aging or related diseases. Further research would be necessary to clarify any potential associations.

### 3. Drug or Drug Classes Interaction
Currently, there is limited information available regarding specific drugs or drug classes that interact with the RNU2-15P gene. Given that it is a pseudogene, it may not be targeted or regulated by pharmacological agents directly. Typically, studies focus on functional ncRNAs or genes rather than on their pseudogenes for drug interactions.

### 4. Pathways and Biological Processes
While RNU2-15P itself does not participate in any well-defined biological pathways due to its status as a pseudogene, functional analogs in the U2 snRNA family are significantly involved in the following pathways and biological processes:
- **mRNA Splicing**: U2 snRNA is a core component of the spliceosome and is critical for the expression of protein-coding genes by excising introns from pre-mRNA.
- **Post-transcriptional Regulation**: Intervening in post-transcriptional modification processes that may indirectly have associations through regulatory networks.

Pseudogenes like RNU2-15P may also contribute to gene regulation by serving as decoys for regulatory molecules (e.g., miRNAs) or providing trans-regulatory effects, although this is an area of ongoing research.

### Conclusion
RNU2-15P functions primarily as a pseudogene with limited documented roles outside of its homology to active U2 snRNAs. It currently lacks significant associations with age-related diseases, known drug interactions, or clearly defined biological pathways. Future research may provide additional insights into the potential functions of such non-coding genes and their relevance in various biological processes.