I'm not sure for an average 15 year old female, but when I was that age, (this was back in 1975 and I was on the girl's track team in high school) I ran it in 5 minutes, 35 seconds which was a county record. so, maybe you can gauge it that way.
A great time is anything 5 minutes or lower.
2 seconds
Puberty does not begin at the same time for everyone. Girls on average begin puberty a year before boys.
15 t0 20ish
55-65s
as fast as ya mum
he shouldn't
im 13 years old and my best time is 12.4 which beats most of the boys in the year above
for a 14 year old boys its round about 15-18 seconds
A 12 year old's average time for the 100 meter dash, should be about 15 or 16 seconds.
An average time for a 14-year-old running the 50 meter dash is around 9 seconds. For a 100 meter dash, it would be about 13 seconds.
20 seconds -- if they are relatively fit. Otherwise, I'd say an average 60-year old wouldn't even make it that far.