| 5-mC | 5-methylcytosine |
| AA | accelerated aging |
| AAG | gene related to accelerated aging |
| AD | Alzheimer’s disease |
| BA | biological age |
| BM | biomarker |
| circRNA | circular RNA |
| HC | healthy control |
| lncRNA | long non-coding RNA |
| MBM | molecular biomarkers |
| MCI | mild cognitive impairment |
| miRNA | microRNA |
| ncRNA | non-coding RNA |
| ND | neurodegeneration |
| NDG | gene that predispose to neurodegeneration |
| NV | neurovascular |
| NVU | neurovascular unit |
| PD | Parkinson’s disease |