The POP7 gene, also known as "Processing of Precursor 7" (and assigned the Ensembl code ENSG00000088961), is essential in the biogenesis of tRNA and the processing of rRNA. 

### 1. Associated Genes
Other genes that are known to be associated with or related to the POP7 gene include:
- **RNPS1**: This gene encodes a protein involved in mRNA processing that may interact with ribonuclease P.
- **RPPH1**: It encodes an RNA 5'-tri-phosphatase enzyme that may have functional overlaps with RNA processing.
- **RNT1**: This gene is involved in RNA processing and could potentially interact with components of the ribonuclease complexes, including RNase P.
- **RMRP**: Associated with the MRP ribonuclease complex, similar to POP7.

### 2. Aging or Age-Related Diseases
Currently, specific direct associations of POP7 with aging or age-related diseases are not well characterized. However, disruption in tRNA and rRNA processing can lead to altered cellular functions and potentially contribute to age-related declines in protein synthesis and other cellular processes. Improper functioning of ribonucleoprotein complexes has been implicated in various diseases, including certain cancers and neurodegenerative diseases, which often show age-associated onset. 

### 3. Drug Interactions
As of my knowledge cutoff in October 2021, no specific drugs or drug classes were directly known to target or interact with POP7. However, since POP7 is part of ribonuclease P and ribonuclease MRP complexes, any compounds that affect RNA processing or ribonucleoprotein complex function might indirectly influence activities associated with the POP7 gene.

### 4. Pathways and Biological Processes
The POP7 gene is involved in several critical biological processes and pathways:
- **tRNA processing**: Particularly in the cleavage of precursor tRNA to form mature tRNA, effectively removing the 5’ leader sequences.
- **rRNA processing**: Part of the MRP complex, which is crucial for the maturation of ribosomal RNA from the transcriptional products.
- **Nuclear RNA metabolism**: Plays a role in the regulation and processing of various RNA species within the nucleolus.

Overall, POP7 is an essential component of the RNA processing machinery that underlies the synthesis of both tRNA and pre-rRNA, impacting a wide array of cellular functions tied to protein synthesis and cellular growth.