The **NXPE2P1** gene is classified as a pseudogene within the NXPE (neurexophilin) family. Here's a detailed overview based on your request:

### 1. Associated Genes
As NXPE2P1 is a pseudogene, it has limited functional characterization and associations. However, it is likely related to the following genes, which are part of the NXPE family:

- **NXPE2**: The expressed homolog, which may provide insights into potential functions.
- **NXPH1, NXPH2**: Additional members of the neurexophilin family that could have overlapping functions or regulatory mechanisms.

### 2. Aging and Age-Related Diseases
Details specifically linking NXPE2P1 to aging or age-related diseases are sparse due to its classification as a pseudogene. However, genes related to the NXPE family can play roles in neuronal functions and synaptic plasticity, processes often associated with neurodegenerative diseases, such as:

- **Alzheimer’s Disease**: Some neurexophilins are studied for their potential implications in synaptic health and degeneration.
- **Parkinson's Disease**: Altered expression of neurexophilins might influence dopaminergic signaling, but specific links to NXPE2P1 remain speculative.

### 3. Drug Interactions
As NXPE2P1 is a pseudogene and does not produce a functional protein, there are currently no known drugs or drug classes directly interacting with this gene. However, associations may exist indirectly through its family members. For example, neurexophilin proteins have been studied in the context of neurological disorders, leading to exploration of:

- **Neuroprotective Agents**: Drugs targeting neuronal health may have pathways influenced by related neurexophilins but not necessarily NXPE2P1.
- **Antidepressants and Neuromodulators**: Drug classes that alter synaptic transmission could potentially interact with the broader neurexophilin functions.

### 4. Pathways and Biological Processes
NXPE2P1 itself does not have well-established pathways or biological processes due to its pseudogene status. However, associated genes in the NXPE family may be implicated in:

- **Synaptic Transmission**: Involvement in the signaling processes between neurons.
- **Regulation of Neuropeptides**: Potential influences on neuropeptide signaling pathways, which are vital for neurotransmission and associated behaviors.
- **Neurodevelopment**: Affecting the development and function of neurons, particularly in contexts where neurexophilin expression is relevant.

Given the current status of NXPE2P1 in research, its functional impacts and associations largely remain a subject for further exploration, especially in the context of its protein coding relatives. To gain deeper insights, continued research and exploration of emerging studies focusing on the NXPE family would be beneficial.