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100 Mile Training Plan - Compete (Advanced)
Ultramarathon - Wikipedia
Age and ultra-marathon performance - 50 to 1,000 km distances from 1969 – 2012, SpringerPlus
IJERPH, Free Full-Text
PDF) Age group performances in 100 km and 100 miles ultra-marathons
Influence of a 100-mile ultramarathon on heart rate and heart rate variability
Masters Age-Related Differences in 100m Sprint Performance
Frontiers Sub 3-Hour Marathon Runners for Five Consecutive Decades Demonstrate a Reduced Age-Related Decline in Performance
Rocky Raccoon 100
Race Info – The Javelina Jundred
PDF) Analysis of performance and age of the fastest 100-mile ultra-marathoners worldwide