The FAM90A26 gene is a relatively less-characterized gene that may encode a protein product associated with a pseudogene. Below is a detailed overview of FAM90A26 based on the information requested:

1. **Associated Genes**:
   - While comprehensive collaborative associations are not broadly documented for FAM90A26, it's important to note that pseudogenes can sometimes show similarities or homology to other functional genes within the same family. Typically, pseudogenes do not have known interactive partners, so specifics about direct associations may be scarce.

2. **Aging and Age-related Diseases**:
   - As of my last training data until October 2023, specific associations between FAM90A26 and aging or age-related diseases have not been extensively studied or documented. Given that it has been proposed to be linked to a pseudogene, it may not have direct implications in age-related pathologies. However, further research could elucidate any potential involvement in regulatory mechanisms that affect aging.

3. **Drug Interactions**:
   - There are currently no well-documented drugs or drug classes that interact directly with the FAM90A26 gene product due to its likely classification as a pseudogene and the limited information available about its function. Research into pseudogenes often highlights that they do not yield functional proteins that interact with pharmaceuticals in the way that traditional coding genes do.

4. **Pathways and Biological Processes**:
   - As a gene that may represent a pseudogene, FAM90A26 has limited involvement in known biological pathways, and functional pathways linked to it are not well characterized. Pseudogenes are typically thought to be non-functional remnants of evolution and may not integrate into specific biological processes like their parent genes. However, some pseudogenes are known to function in the regulation of their related genes, potentially impacting gene expression dynamically through RNA interference or competition.

In conclusion, the FAM90A26 gene is characterized as a potential pseudogene with limited functional characterization available. Future research may uncover more information regarding its biochemical activity, possible interactions, or its roles relating to aging and disease.