Anselm Leboutn - 4:37 mile at age 55. All running on the track
MONDAY: 4 miles on the track @ 6:45/mile pace
TUESDAY: 6 miles on the track @ 6:40 pace
WEDNESDAY: 1-mile warm-up; 2 sets of 5 x 100m @ 14.5–15 seconds with 40 seconds rest; 4:00 rest between sets; 1-mile cool-down
THURSDAY: 5 miles on the track @ 6:50 pace
FRIDAY: 1-mile warm-up; 150m (20.1 seconds), walk 200m, 450m (1:06), walk 400m, 200m (27.1); 1-mile cool-down
SATURDAY: 3-lap warm-up; 1,000m in 2:44; 5-lap cool-down
SUNDAY: Rest
MONDAY: 5 miles on the track @ 6:45 pace
TUESDAY: 5 miles on the track @ 6:40 pace; 5 x 100m in 14.5 seconds or better
WEDNESDAY: 1.5-mile warm-up; 4 x 300m with 45–50 seconds rest (47.8, 48.4, 45.4, 44.8); 1.5-mile cool-down
THURSDAY: 5 miles on the track @ 6:50 pace
FRIDAY: Rest
SATURDAY: 1-mile warm-up; 2 x 400m with a 400m walk between (63.4, 59.0); 1-mile cool-down
SUNDAY: Rest
https://www.runnersworld.com/masters/age-group-ace-anselm-lebourne