The RNU7-25P gene encodes a small nucleolar RNA (snoRNA), which is part of the class of non-coding RNAs involved in various RNA processing activities, particularly in the modification of ribosomal RNA (rRNA) and small nuclear RNA (snRNA) within the nucleolus. Though comprehensive details about this gene may not be widely documented, here is an overview addressing your specific requests:

### 1. Associated Genes
RNU7-25P may have associations with other snoRNAs and non-coding RNA genes. However, specific gene interactions are not prominently detailed in the literature. Other snoRNAs often sharing regulatory or functional pathways might include members of the C/D box snoRNA family, such as RNU7-1, RNU7-2, and other closely related snoRNA genes involved in rRNA modification processes.

### 2. Aging or Age-Related Diseases
While there is limited direct evidence linking RNU7-25P specifically to aging or age-related diseases, snoRNAs are generally important for ribosome biogenesis and cellular function, aspects that can be impacted by aging. Dysregulation of snoRNAs has been linked to various cellular senescence processes and could potentially play a role in diseases such as cancer, where aberrant cell proliferation occurs. 

Some studies have indicated that the dysregulation of small non-coding RNAs, including snoRNAs, may contribute to the aging process or age-related pathologies like neurodegenerative diseases; however, specific studies on RNU7-25P in the context of aging are not well established.

### 3. Drug or Drug Classes Interaction
Currently, there are no specific drugs or drug classes widely reported to interact with RNU7-25P. As it is a non-coding RNA, drugs are more likely to target pathways or processes that involve snoRNA function rather than the snoRNA itself. Future research may uncover more connections to pharmacological interactions, particularly if specific therapeutics modulate non-coding RNA pathways in conditions like cancer or neurodegenerative diseases.

### 4. Pathways and Biological Processes
RNU7-25P is primarily associated with the following biological processes:

- **Ribosome Biogenesis**: As a snoRNA, RNU7-25P plays a role in the modification of rRNA, which is crucial for the assembly of ribosomes.
- **RNA Modification**: It is involved in the 2'-O-methylation of rRNA, a modification necessary for the structural and functional maturation of ribosomal RNA.
- **Nucleolar Function**: It contributes to nucleolar organization and the processing of pre-rRNA transcripts.

Further pathways may include general pathways related to gene expression regulation and RNA processing, but specific pathways related to RNU7-25P are not well established in current databases.

### Summary
While RNU7-25P is a recognized small nucleolar RNA with a functional role in rRNA modification, its connections to other genes, specific diseases, drugs, and detailed biological pathways require more focused research to elucidate its comprehensive role within molecular biology and pathology.