The MTND3P13 gene is a pseudogene related to mitochondrial ND3, which is also known as the NADH dehydrogenase subunit 3 gene. Below is a comprehensive overview addressing the specifics you've requested.

### Gene Overview
- **Gene Symbol**: MTND3P13
- **Type**: Pseudogene
- **Location**: Mitochondrial
- **Function**: As a pseudogene, it is typically not expected to encode a functional protein but may have regulatory roles or act as a source of RNA.

### 1. Associated Genes
While MTND3P13 is primarily related to mitochondrial function, there are other mitochondrial genes that are often mentioned in connection or in pathway contexts:
- **MTND3 (Mitochondrially Encoded NADH Dehydrogenase 3)**: This is the functional gene from which MTND3P13 is derived.
- **MTND1, MTND2, MTND4**: Other mitochondrial genes coding for NADH dehydrogenase subunits.
- **MTATP6, MTCO1**: These genes are also part of the mitochondrial electron transport chain and may show co-expression under certain conditions.

### 2. Aging and Age-Related Diseases
While direct studies specifically linking MTND3P13 to aging or age-related diseases may be limited, mitochondrial dysfunction is a well-established factor in aging and several age-related diseases, including:
- **Neurodegenerative Disorders**: Mitochondrial genes are associated with conditions like Alzheimer’s, Parkinson’s, and Huntington’s disease, which can involve alterations in mitochondrial DNA.
- **Metabolic Disorders**: Dysregulation of mitochondrial function can lead to metabolic syndromes common in aging.
- **Cancer**: Mitochondrial anomalies have been implicated in various cancers, relating to changes in energetic and apoptotic pathways.

### 3. Drug Interactions
Currently, specific drugs or drug classes directly interacting with MTND3P13 are not well defined due to its nature as a pseudogene. However, drugs targeting mitochondrial dysfunction, such as:
- **Mitochondrial Biogenesis Activators**: Compounds like resveratrol or metformin may indirectly relate to genes of the mitochondrial synthesis pathway.
- **Antioxidants**: Drugs aimed at reducing oxidative stress can also be relevant, given that mitochondrial dysfunction often contributes to oxidative damage.

### 4. Pathways and Biological Processes
MTND3P13 is involved in:
- **Mitochondrial Electron Transport Chain**: Although a pseudogene, its relation to ND3 suggests potential links in energy metabolism pathways.
- **Oxidative Phosphorylation**: Pertaining to ATP synthesis via electron transport and proton gradient formation in the mitochondria.
- **Regulation of Reactive Oxygen Species (ROS)**: Mitochondrial genes generally have roles tied to ROS generation and modulation, impacting cellular signaling and stress responses.

### Conclusion
In summary, MTND3P13 serves primarily as a pseudogene associated with mitochondrial functions, with implications in aging and age-related diseases largely through the context of mitochondrial metabolism and bioenergetics. Its association with other mitochondrial genes highlights its potential indirect role in pathways critical for cellular health and longevity, even if direct functional insights remain limited due to its pseudogene status.