The MIR6879 gene is part of the microRNA family, which plays an essential role in the post-transcriptional regulation of gene expression. While the summaries provided offer a good overview of MIR6879's general function and biogenesis, here's a more detailed response to your specific requests:

### 1. Associated Genes
The function of MIR6879 as a microRNA suggests it may regulate several target genes, although specific targets may not be explicitly detailed in the summary. Some studies that have investigated microRNA associations may include targets such as:
- **MIR4677**: Another microRNA that could be influenced by similar regulatory pathways.
- **MIR133a**: Known to play roles in cardiac and muscle development, potentially intersecting with MIR6879 in functional pathways.

Specific interactions depend on tissues and cell types, and studies utilizing methods such as luciferase reporter assays or gene knockdown approaches can provide precise target validations.

### 2. Aging and Age-Related Diseases
While there may not be direct mentions of MIR6879 in relation to aging in the literature, research on various microRNAs suggests they often play critical roles in:
- Regulation of cell proliferation and apoptosis, which are crucial in aging processes.
- Involvement in neurodegenerative diseases and cancers, where miRNAs, including potential candidates such as MIR6879, can impact disease progression and longevity.

For specific evidence linking MIR6879 to aging or age-related disease models, accessing current peer-reviewed journals or databases may provide the latest insights.

### 3. Drug Interactions
As of the current available information, no specific drugs or drug classes are explicitly reported to interact with MIR6879. However, drugs that modulate miRNA function or mimic/destroy miRNAs are becoming increasingly relevant in therapeutics and could potentially target this microRNA. Investigational therapeutics that aim to modulate microRNAs include:
- **miRNA mimics**: Synthetic versions that stimulate the pathway by enhancing the activity of specific miRNAs.
- **Antisense oligonucleotides**: Compounds designed to bind to and inhibit specific microRNAs.

### 4. Pathways and Biological Processes
MIR6879 is involved in several biological pathways, mainly centered around:
- **Gene Silencing**: As part of the RNA-induced silencing complex (RISC), it contributes to the downregulation of gene expression post-transcriptionally.
- **Cell Cycle Regulation**: miRNAs are known to play roles in the regulation of cell cycle progression, which affects growth, development, and response to stress.
- **Developmental Processes**: MicroRNAs generally have established roles in the modulation of cellular differentiation and organ development.

MIR6879's actual functional pathways could be explored via bioinformatics tools like KEGG, Reactome, or similar databases that link specific microRNAs to broader signaling pathways.

### Summary
MIR6879 is a crucial component of the gene regulation network in multicellular organisms, and while its specific functional relationships and implications in diseases like aging require further investigation, it shares similarities with other miRNAs in critical biological processes. For the most current details, searching peer-reviewed studies that specifically cover MIR6879 within the context of your topics of interest would yield further insights.