Age-group thresholds
IRONMAN 70.3 Western Massachusetts · 3 editions (2023, 2024, 2025) · 3,321 finishers
How to read it: in each row, the time under "Top 10%" is the time of the slowest athlete who still made the fastest 10% of the age group. Beat that time and you are in. Age groups with fewer than 5 finishers are omitted. Finishers only.
Men
| Age group | Finishers | Top 1% | Top 5% | Top 10% | Top 20% | Median | Best |
|---|---|---|---|---|---|---|---|
| All age groups | 2,431 | 3:51:02 | 4:13:08 | 4:26:43 | 4:47:28 | 5:30:46 | 3:30:03 |
| M18-24 | 175 | 3:51:10 | 4:03:17 | 4:22:49 | 4:39:16 | 5:27:26 | 3:30:03 |
| M25-29 | 292 | 3:47:19 | 4:07:20 | 4:23:48 | 4:40:12 | 5:21:44 | 3:30:19 |
| M30-34 | 325 | 3:46:22 | 3:59:38 | 4:18:16 | 4:38:57 | 5:24:45 | 3:42:13 |
| M35-39 | 309 | 3:45:57 | 4:08:02 | 4:17:53 | 4:33:44 | 5:26:24 | 3:31:46 |
| M40-44 | 306 | 3:45:30 | 4:12:53 | 4:21:23 | 4:41:27 | 5:27:15 | 3:36:42 |
| M45-49 | 316 | 4:05:59 | 4:20:07 | 4:34:02 | 4:50:41 | 5:25:16 | 3:53:46 |
| M50-54 | 302 | 4:12:25 | 4:26:10 | 4:39:03 | 4:56:01 | 5:36:23 | 3:58:05 |
| M55-59 | 205 | 4:12:14 | 4:28:22 | 4:34:50 | 4:58:00 | 5:43:46 | 4:01:58 |
| M60-64 | 133 | 4:18:50 | 4:46:12 | 4:54:58 | 5:10:27 | 5:57:13 | 4:12:50 |
| M65-69 | 49 | 4:30:18 | 5:04:39 | 5:15:54 | 5:35:06 | 6:09:45 | 4:30:18 |
| M70-74 | 16 | 5:09:09 | 5:09:09 | 5:38:58 | 5:46:24 | 6:30:13 | 5:09:09 |
Women
| Age group | Finishers | Top 1% | Top 5% | Top 10% | Top 20% | Median | Best |
|---|---|---|---|---|---|---|---|
| All age groups | 890 | 4:21:46 | 4:41:05 | 4:57:13 | 5:15:43 | 6:01:05 | 4:03:54 |
| F18-24 | 55 | 4:25:29 | 4:36:24 | 4:51:25 | 5:08:50 | 5:59:15 | 4:25:29 |
| F25-29 | 106 | 4:29:42 | 4:38:45 | 4:52:06 | 5:06:39 | 5:44:59 | 4:15:37 |
| F30-34 | 109 | 4:28:32 | 4:49:29 | 5:06:12 | 5:22:10 | 6:07:01 | 4:13:11 |
| F35-39 | 109 | 4:21:46 | 4:41:57 | 4:51:05 | 5:01:30 | 5:47:45 | 4:04:03 |
| F40-44 | 135 | 4:17:12 | 4:37:19 | 4:54:12 | 5:09:07 | 5:56:27 | 4:03:54 |
| F45-49 | 124 | 4:15:13 | 4:36:01 | 4:49:05 | 5:10:05 | 5:49:49 | 4:10:37 |
| F50-54 | 115 | 4:34:36 | 4:50:34 | 5:07:00 | 5:24:36 | 6:05:18 | 4:31:36 |
| F55-59 | 76 | 4:30:35 | 4:51:35 | 5:13:42 | 5:40:15 | 6:23:18 | 4:30:35 |
| F60-64 | 39 | 5:02:35 | 5:14:43 | 5:24:57 | 5:44:59 | 6:29:34 | 5:02:35 |
| F65-69 | 15 | 5:13:53 | 5:13:53 | 5:18:34 | 5:45:40 | 6:52:17 | 5:13:53 |
| F70-74 | 6 | 5:09:20 | 5:09:20 | 5:09:20 | 5:40:42 | 5:54:05 | 5:09:20 |
Source: Seffrin A., Nikolaidis P.T., Andrade M.S., Villiger E., Rosemann T., Weiss K., Ferreira D., Knechtle B. (2026). A dataset of 2.7 million IRONMAN triathlon records with transition times (2002-2026), v3.0.0. Zenodo. CC BY 4.0. doi:10.5281/zenodo.22097794.