Average 400m times improve sharply through the teens as athletes build the speed endurance the event demands. The marks below are typical for developing school athletes rather than championship times, so they show roughly where you sit and how much is above you. Here is how the average moves with age and what separates average from good.
The 400 rewards the ability to hold speed under fatigue, which builds slowly. Young athletes often run a fast 200 and fall apart, so average 400 times stay high until structured endurance work arrives, usually in the mid teens.
These are typical times, not competitive ones. A good varsity 400 is well under the age-18 average here, around 50.5 for boys and 58 for girls. The gap is almost always pacing and the tolerance to finish.
Even pacing and speed endurance, not heroics. Run the first 200 controlled, build the back-half engine with longer reps, and your time drops past what age alone would give you.
An average shows the ballpark. Film a fatigued 400, the AI flags the mechanic that breaks first in the last 100, so you train the actual limiter and climb past the age average.
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Typical boys' times by age, girls' times in the table below. These are average developing marks, not competitive ones.
Typical developing-athlete times. Competitive marks are faster.
| Age | Boys | Girls |
|---|---|---|
| 10 | 1:15 | 1:20 |
| 12 | 1:08 | 1:14 |
| 14 | 1:02 | 1:09 |
| 16 | 57 s | 1:05 |
| 18 | 54 s | 1:03 |
Common questions athletes and coaches ask about this topic.
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