The RNU7-156P gene is part of a family of small nucleolar RNAs (snoRNAs), specifically identified as a pseudo gene variant of the U7 small nuclear RNA. Here are the details based on the information provided, along with additional insights pertaining to your queries:

### General Overview of RNU7-156P
- **Gene Symbol**: RNU7-156P
- **Function**: Generally, snoRNAs like RNU7-156P are involved in the biogenesis of ribosomal RNA and the modification of rRNA, tRNA, and snRNA through methylation or pseudouridylation.

### 1. Associated Genes
While specific associations of RNU7-156P with other genes might not be well-documented, small nucleolar RNAs are often associated with:
- Other snoRNA genes (both within the U7 family and across different families).
- Genes involved in RNA processing and ribosome biogenesis.
- Related genes may include those responsible for various RNA modification pathways, but specific gene associations would typically depend on the context of particular studies or databases that summarize interactions (e.g., Gene Ontology annotations).

### 2. Aging and Age-Related Diseases
There isn't extensive documented research linking RNU7-156P specifically to aging or age-related diseases. However, since snoRNAs are involved in ribosome biogenesis and RNA metabolism, perturbations in these processes can theoretically contribute to cellular aging and age-associated decline in cellular function. Changes in snoRNA expression have been implicated in:
- Cancer
- Neurodegenerative diseases
- Various age-related pathologies 

Research often investigates the broad roles of snoRNAs in gene expression regulation, which can be indirectly relevant to aging processes.

### 3. Drug Interactions
As of the latest update, no specific drugs or drug classes have been directly linked to RNU7-156P. However, any drugs that affect RNA metabolism, ribosome biogenesis, or epigenetic modifications may indirectly affect the function of snoRNAs, including RNU7-156P. Potential drug classes could include:
- Antisense oligonucleotides
- Drugs targeting RNA polymerase activity

### 4. Pathways and Biological Processes
RNU7-156P is generally involved in:
- **Ribosome Biogenesis**: It plays a role in the assembly and modification of the ribosome.
- **rRNA Modification**: As a snoRNA, it aids in the chemical modification of rRNA, which is crucial for ribosomal function.
- **RNA Processing**: It may be involved in the broader biological process of RNA maturation and processing.

### Conclusion
The RNU7-156P gene, as a member of the snoRNA family, plays a key role in RNA metabolic processes. While the specifics about its involvement in aging or drug interactions remain elusive, continuing research in the field of RNA biology may reveal further functional insights and relevance of RNU7-156P in health and disease. For detailed annotations and potential new findings, consulting databases like NCBI Gene, UniProt, and specific literature in RNA biology would provide the most current information.