K.Grovdal, Norway (14/06/1990) (31 in 2021)
Actually if you look at her combination of speed, and strength she is way ahead of the game compared to most distance runners. If she were to train like a middle distance runner it is conceivable that K.G. might run 159 and 359 (800/1500) or thereabouts, and by default her 3000 to 10,000 m times would /might also become quite a bit quicker (8:20/14:30/30:00).
However, at her age, not sure how long she can keep on improving, but in Norway they have a very good sports medical back up back up system so it is conceivable she could keep on improving until her mid-30s a few years from now.
When she ran that superb 10 km road race in Norway back in October (2020) she was striding out with runners who are worth in the 2930 minute range for 10 K. Monster performance.
800 Metres 2:04.23 Oslo (NOR) 23 JUN 2016 1088
1500 Metres 4:05.57 Olympiastadion, Stockholm (SWE) 10 JUN 2018 1161
One Mile 4:26.23 Bislett Stadion, Oslo (NOR) 09 JUN 2016 NR 1146
2000 Metres 5:41.04 Florø (NOR) 02 JUN 2018 NBP 1131
3000 Metres 8:37.58 Stade Louis II, Monaco (MON) 21 JUL 2017 1182
5000 Metres 14:51.66 Olympic Stadium, London (GBR) 21 JUL 2019 1179
10,000 Metres 31:14.07 Estádio Olímpico, Rio de Janeiro (BRA) 12 AUG 2016 1180
2000 Metres Steeplechase 6:21.39 Stavanger (NOR) 10 AUG 2008 NBP 1118
3000 Metres Steeplechase 9:13.35 Sandnes (NOR) 26 AUG 2017 NR 1210
5 Kilometres 14:39 Maarud gård (NOR) 01 MAY 2021 WR(p), AR(p), NBP 1234
10 Kilometres 30:32 Hole (NOR) 17 OCT 2020 1239
Half Marathon 1:09:41 Oslo (NOR) 22 SEP 2012 1154