The GRM7-AS3 gene is an antisense RNA transcript associated with the GRM7 gene, which encodes a metabotropic glutamate receptor involved in neurotransmission and synaptic plasticity. Though information about GRM7-AS3 specifically may be limited, here's a detailed response that includes the requested information:

### 1. Associated Genes
GRM7-AS3 is primarily associated with the GRM7 gene, which is part of the metabotropic glutamate receptor family. Other genes that may have functional or regulatory associations include:

- **GRM1**: Another member of the metabotropic glutamate receptor family that has roles in neural signaling.
- **GRM5**: This gene also encodes a glutamate receptor and may have interactions in the pathways that include GRM7.

Additionally, specific variants or regulatory elements near GRM7-AS3 might also show associations with genes involved in synaptic function or neurodegenerative processes.

### 2. Aging and Age-Related Diseases
While specific studies focused on GRM7-AS3 are limited, the GRM7 gene has been implicated in various neurological processes and disorders that are relevant to aging. The following details are notable:

- **Neurodegenerative Diseases**: Abnormal glutamate signaling may contribute to conditions such as Alzheimer's and Huntington's disease. This could have a downstream effect on GRM7-AS3 due to its proximity to the GRM7 gene.
- **Cognitive Decline**: Alterations in glutamate receptor signaling, including that involving GRM7, have been linked to age-related cognitive decline and susceptibility to various age-related neuropsychiatric disorders.
  
### 3. Drug Interactions
While no direct drugs are currently established to target GRM7-AS3 specifically, drugs modulating glutamate signaling may impact pathways associated with the GRM7 gene:

- **Antipsychotics**: Some treatments for schizophrenia aim to balance glutamate signaling.
- **NMDA Receptor Antagonists**: Substances like ketamine have been studied for their rapid antidepressant effects, which may influence GRM pathways indirectly.

### 4. Pathways and Biological Processes
GRM7-AS3 is involved in pathways and biological processes related to:

- **Synaptic Transmission**: The GRM7 gene contributes to metabotropic glutamate receptor signaling, which is essential for synaptic plasticity and neurotransmission.
- **Neurotransmitter Release**: The receptor influences the release of neurotransmitters and can modulate excitatory postsynaptic potentials.
- **Regulation of Neuronal Excitability**: As part of signaling pathways, it plays a role in modulating neuronal excitability and inform mechanisms related to mood, cognition, and behavior.

### Conclusion
While the GRM7-AS3 gene may not have extensive standalone research, it is closely associated with the GRM7 gene, which is pivotal in neurological function, particularly related to glutamate signaling. Its implications in aging and potential therapeutic targets are mainly indirect but relevant for ongoing research in neurodegenerative disease mechanisms and treatments. Further investigations may clarify its specific roles and implications in genetic regulation, aging, and potential pharmacological interactions.