The **RNU7-90P** gene is classified as a small nucleolar RNA (snoRNA), which is predicted to be involved in RNA processing. Here is a more detailed overview based on your requests:

### 1. Associated Genes
RNU7-90P may be associated with several genes involved in RNA processing and modification pathways. However, specific associated genes are often not well defined for snoRNA genes in the same way they are for protein-coding genes. Some genes known to interact with similar snoRNAs include:
- **NOP56** (Nucleolar Protein 56)
- **NOP58** (Nucleolar Protein 58)
- Other **snoRNA** genes may also show co-expression or regulatory interactions.

### 2. Aging and Age-related Diseases
While specific research directly linking RNU7-90P to aging or age-related diseases is limited, snoRNAs are known to play important roles in cellular homeostasis and may influence processes such as:
- Ribosome biogenesis
- Splicing and RNA modifications
These processes are important in the context of aging as dysregulation can lead to age-related pathologies, including neurodegenerative diseases and certain cancers. Future studies could help identify specific links.

### 3. Drug Interactions
As of October 2023, there are no specific drugs or drug classes directly known to interact with the RNU7-90P gene. Its role as a non-coding RNA suggests that it is not a direct target of pharmacological agents. However, compounds affecting RNA processing or cellular metabolism may indirectly influence snoRNA function and, by extension, RNU7-90P activity.

### 4. Pathways and Biological Processes
RNU7-90P is involved in several biological processes, including but not limited to:
- **RNA Processing**: The gene is involved in the modification and processing of RNA molecules, particularly pre-mRNA and rRNA.
- **Nucleolar Organization**: Similar snoRNAs assist in maintaining the structure and function of the nucleolus, which is critical for ribosome assembly.
- **Regulation of Gene Expression**: By influencing the stability and processing of RNA, RNU7-90P can have an impact on gene regulatory networks.

In summary, RNU7-90P plays a role in fundamental cellular processes associated with RNA metabolism, but there remains an ongoing need for more specific studies to elucidate its exact functions, particularly regarding its potential roles in aging and disease mechanisms.