Is walking one mile in 10.14 for a 57-year old woman considered to be in the top 1% for her age?

Yes, walking one mile in 10 minutes and 14 seconds for a 57-year-old woman is likely in the top 1% for her age group.  

Google, AI Overview

Top 1% for my age group: WALK: TIME: 10.14 DISTANCE 1.00 AVG SPEED 5.8 MAX SPEED 7.4 IMPROVEMENT FROM PREVIOUS WALK: 28 seconds 

Part I: Warm-up exercises: Less than one minute

Part II: Speed: Increase initial speed from 3.0 to 3.7 at .01 miles at each change of speed 

Part III: Speed: Increase initial speed from 3.8 to 4.3 at .01 miles at each change of speed 

Part III: Walk: 1st mile: Initial speed: 4.3

4.5 .50 mi

4.8 .75 m

5.0 .85 m

5.1 .92 mi

5.3-5.4 .94 mi

5.5-5.6 .96 mi

5.7-6.0 .98 mi to end of mile

Time: 13:16 for the 1st mile

Part IV: Walk: 2nd mile: Initial speed: 5.8

5.9 .50 mi

6.0 .75 mi

6.1 .85 mi

6.2-7.0 .90 to end of mile

Time: 10.14 for the 2nd mile

Part VI: Warm-down exercises: Less than one minute

True Treadmill