The DDC-AS1 gene, also known as DDC antisense RNA 1, is an important long non-coding RNA (lncRNA) that serves regulatory roles in cellular processes. Here's a detailed overview addressing your points:

### 1. Associated Genes
While the NCBI and UniProt summaries may not always cover this, DDC-AS1 has been associated with several other genes through various expression profiling studies and functional analyses. Some of the genes often reported in association with DDC-AS1 include:
- **DDC (Dopa Decarboxylase)**: As the primary gene of interest, DDC-AS1 is an antisense RNA to the DDC gene, which is involved in the biosynthesis of neurotransmitters.
- **ABCC4 (ATP-binding cassette sub-family C member 4)**: Associated with transport processes that may be regulated by lncRNA activities.
- **NR4A1 (Nuclear Receptor Subfamily 4 Group A Member 1)**: Implicated in neurodegenerative processes and metabolism.

### 2. Aging and Age-Related Diseases
Research has indicated potential involvement of DDC-AS1 in aging and age-related diseases:
- **Neurodegenerative Disorders**: Given the role of DDC in neurotransmitter synthesis and the nervous system, aberrant expression of DDC-AS1 has been implicated in conditions like Parkinson’s disease.
- **Cancer**: Some studies have suggested that lncRNAs, including DDC-AS1, may influence cancer progression and cellular senescence, highlighting the gene's potential role in aging.
- **Metabolic syndrome**: There is emerging evidence that lncRNAs could also influence metabolic pathways and diseases associated with aging.

### 3. Drug Interactions
As of the latest data, there are no specific drugs or drug classes documented that directly target DDC-AS1. However, considering its regulatory role and association with DDC, drugs affecting dopamine metabolism or neurotransmitter regulation (like antiparkinsonian drugs) may indirectly involve DDC-AS1 through modulation of DDC activity.

### 4. Pathways and Biological Processes
DDC-AS1 is involved in various biological processes:
- **Regulation of Gene Expression**: As a lncRNA, DDC-AS1 may modulate expression levels of nearby genes, especially the DDC gene itself.
- **Neurotransmitter Biosynthesis**: The DDC gene is vital for synthesizing dopamine, and DDC-AS1 may exert regulatory functions here.
- **Cellular Response to Stress**: Some studies suggest lncRNAs play a significant role in cellular stress responses, which could intersect with aging pathways.
- **Developmental Processes**: lncRNAs are known to be involved in various developmental regulations, with implications in neuronal development.

In summary, while DDC-AS1 is a long non-coding RNA closely associated with the regulation of DDC and possibly other genes, its implications in aging and numerous biological processes emphasize its significance in health and disease contexts. Continued exploration is necessary to fully elucidate its roles and interactions.