Table 1. DNA methylation data. The rows correspond to Illumina DNA methylation data sets.
| No. | Data Source | Use | n | Source | Median Age (Range) |
| 1 | existing, Portales-Casamar 2016, GSE80261 | Train | 216 | Buccal | 11 (5,18) |
| 2 | existing, Berko 2014, GSE50759 | Train | 96 | Buccal | 7 (1,28) |
| 3 | novel, blood methylation | Train | 278 | whole blood | 69 (2,92) |
| 4 | existing, Yang 2017, GSE104471 | Train | 72 | Epithelium | 30 (24,74) |
| 5 | existing, Ivanov 2016, GSE77136 | Train | 21 | Fibroblast | 33 (0.1,85) |
| 6 | existing, Wagner 2014, GSE52026 | Train | 10 | Fibroblast | 37 (23,63) |
| 7 | novel fibroblasts | Train | 48 | Fibroblast | 50 (0.42,94) |
| 8 | novel, Cell Applications | Train | 11 | Fibroblast | 56 (7,94) |
| 9 | existing, Borman 2016, SkinE-MTAB-4385 | Train | 108 | Skin | 49.25 (18,78) |
| 10 | existing, cord blood, GSE79056 | Train | 36 | cord blood | 0 (-0.28,0.04) |
| 11 | existing, Jessen 2016, GSE94876 | Test | 120 | Buccal | 46 (35,60) |
| 12 | Lussier 2018, GSE109042 | Test | 53 | Buccal | 10 (3.5,18) |
| 13 | existing, Vandiver 2015, GSE51954 | Test | 78 | Dermis+Epidermis | 65 (20,92) |
| 14 | novel, Kenneth Raj | Test | 23 | Endothelial | 19 (19,19) |
| 15 | novel, Kenneth Raj | Test | 44 | Endothelial | 19 (17,26) |
| 16 | novel, Kenneth Raj | Test | 48 | Fibroblast | 0 (0,0) |
| 17 | novel, Kenneth Raj | Test | 48 | Fibroblast | 0 (0,0) |
| 18 | novel, Progeria Research Foundation+ vendors | Test | 88 | Fibroblast | 8 (0,77) |
| 19 | novel, Junko Oshima | Test | 11 | Fibroblast | 36 (0,62) |
| 20 | novel, Kenneth Raj | Test | 43 | Keratinocyte | 0 (0,0) |
| 21 | novel, Blood methylation Inf 450 | Test | 100 | Whole Blood | 53 (19,82) |
| 22 | novel, Lymphoblastoid cell | Test | 100 | Lymphoblast | 53 (19,82) |
| 23 | novel, Saliva methylation | Test | 120 | Saliva | 44 (18, 81) |
| 24 | existing, Horvath 2015, GSE111223 | Test | 229 | Saliva | 68 (36,88) |
| 25 | existing, cord blood, GSE62924 | Test | 38 | cord blood | 0 (-.10,0.04) |
| 26 | existing, cord blood, GSE80283 | Test | 183 | cord blood | -0.22(-0.3,-0.1) |
The table reports the data set number, relevant citation (first author and publication year), public availability (for example, Gene Expression Omnibus identifier), sample size (n), source of the DNA (for example, tissue), median age, age range (minimum and maximum age). The column ‘Use’ reports whether the data set was used as a training set or test set.