| Authors | Country | Years | Age range | Prevalence |
| Diallo et al. [14] | Senegal | 2015 | ≥60 | 27.5% |
| Ishani et al. [9] | India | 2009 | ≥67 | 3.1% |
| Pascual et al. [8] | Spain (Madrid) | 1998 | ≥80 | 39% |
| Pascual et al. [8] | Spain (Madrid) | 1998 | 65 - 79 | 48% |
| Turgutalp et al. [20] | Türkiye | 2017 | 65 - 75 | 5.8% |
| Turgutalp et al. [20] | Türkiye | 2017 | ≥75 | 11% |
| Our study | Senegal | 2011-2015 | >60 | 3.34% |