The PMM2P1 gene (Phosphomannomutase 2 pseudogene 1) is a pseudogene located on chromosome 16. Here is a summarized response based on the details requested:

### 1. Associated Genes
While specific associations may vary, PMM2P1 is often associated with its functional paralog, **PMM2**, which encodes the active form of phosphomannomutase, an enzyme involved in the synthesis of glycoproteins and glycolipids. Other genes that may show some indirect association due to their involvement in glycosylation processes or related pathways include:
- **PMM1**: Also involved in the phosphomannomutase activity.
- **GALT (Galactose-1-phosphate uridylyltransferase)**: Involved in carbohydrate metabolism processes overlapping with pathways affected by PMM2.
- **MPI (Mannose Phosphate Isomerase)**: Could also have relevance due to the interconnectedness of the carbohydrate metabolism pathway.

### 2. Aging and Age-Related Diseases
As of current knowledge, specific studies directly linking PMM2P1 to aging or age-related diseases are limited. However, its functional counterpart, PMM2, is known to be involved in glycosylation processes which are critical for many cellular functions. Disruptions in glycosylation pathways have been implicated in various age-related diseases, including neurodegenerative conditions and certain cancers. It is worth exploring potential roles in these contexts, but specific evidence for PMM2P1 is not yet established.

### 3. Drug Interactions
There are currently no specific drugs or drug classes directly interacting with PMM2P1 known from literature. The importance of PMM2 in metabolic pathways may imply that drugs affecting glycosylation could hypothetically influence the related processes, but specific pharmacological interaction data for PMM2P1 are not established at this time.

### 4. Pathways and Biological Processes
PMM2P1, being a pseudogene, is not known to participate directly in biological processes. However, its functional counterpart PMM2 is involved in:
- **Glycosaminoglycan and Glycoprotein Biosynthesis**: PMM2 is integral in the production of GDP-mannose, a substrate for glycosylation.
- **Fructose and Mannose Metabolism**: It plays a role in converting mannose-6-phosphate to mannose-1-phosphate, essential for glycoproteins.
- **Overall carbohydrate metabolism**: PMM2, and by association PMM2P1, are relevant in metabolic pathways involving carbohydrates.

Further studies may elucidate any functional roles or regulatory mechanisms for PMM2P1, particularly in the context of its potential effects via PMM2-related pathways.