The VN1R90P gene, also known as Vomeronasal 1 Receptor 90P, is a member of the vomeronasal receptor family, which is involved in pheromone detection and plays a role in the olfactory system. The "P" in its designation denotes that it is a pseudogene, meaning it is a non-functional variant that has lost its protein-coding ability due to mutations.

### 1. Related Genes
While VN1R90P itself is a pseudogene, it is part of a larger family of vomeronasal receptor genes (the VN1R gene family) that includes several other genes involved in chemosensory functions. Some relevant nearby or related genes include:
- **VN1R1**: Another functioning vomeronasal receptor.
- **VN1R2**: Another receptor in the same family.
- **VN1R3**: Part of the vomeronasal receptor family.

Additionally, the various expressed vomeronasal receptor genes may be linked through shared pathways and mechanisms in olfactory signaling.

### 2. Aging and Age-Related Diseases
Currently, there is no direct evidence linking VN1R90P specifically to aging or age-related diseases due to its pseudogene status. Pseudogenes are not generally known to play active roles in gene regulation or disease pathways. However, further studies into the broader family of vomeronasal receptors and their roles in sensory perception might provide insights into how impairments in these pathways could hypothetically relate to aging or sensory decline.

### 3. Drug Interactions
As VN1R90P is a pseudogene and does not code for a protein, it is unlikely to have direct drug interactions or be relevant in pharmacological contexts. However, the functional vomeronasal receptors may interact with various signaling molecules and have implications in behavioral responses to pheromones, which can influence social and reproductive behaviors, indirectly implicating interactions with substances affecting olfaction or pheromonal signaling.

### 4. Pathways and Biological Processes
Since VN1R90P is a pseudogene, it does not participate in biological processes to the extent that functional genes do. However, the active vomeronasal receptors, in general, are involved in:
- **Olfactory signaling pathways**.
- **Responses to pheromones**.
- **Regulation of reproductive behaviors**.
  
Vomeronasal receptors generally participate in G protein-coupled receptor (GPCR) signaling pathways which are essential for sensory signaling.

### Summary
In summary, VN1R90P is a pseudogene in the vomeronasal receptor family and does not code for a functional protein. Its direct associations with aging, drug interactions, and specific biological processes are limited. Further exploration of the broader vomeronasal receptor family may reveal more about olfactory and chemosensory functions, potentially contributing to understanding sensory decline in aging.