Depends.
Yes, running a 5K in 18 minutes is a great time for a 15 year old. Congrats.I believe a 15 year old running a 5K in 18 minutes is excellent; competing time for a 5K is 19-20 minutes.
The cycling equivalent distance to running a 5k is approximately 15 kilometers.
Kenenisa Bekele running a 5k on the track in a time of 12:37.35.
Age is of very little importance to running a 5K race. As long as you are in good shape and are confident in your ability to complete your goal, you are able to take part in a 5K race.
The From The Couch To 5K System is a set of steps that can get you quickly and in a stable manner from no running to doing 5K!
I've been running 5k for around 6 eweks now (previously unable to run full 5k). I started out at 42 mins but now running 5k in 36.04. I'm still about 30 pounds over my desired weight so hope to improve further. Hope this helps.
I would say it is a completely respectable time and let's me know that there is plenty of potential. You will plateau if you do not maintain running in the off season. I ran X-C in HS and college so I know what I am talking about.
This depends on a lot of things such as fitness. If in doubt consult a doctor.
5k?
try the couch to 5k. Google it and you can also download podcasts to your ipod. I just started it myself. I am running my 1st 5k this November.
Chris Everts of SWFl ran the worlds fastest 5k with a time of 13:17 back in nov. 12, 2008
If you constantly run on a treadmill and practice, running six miles is a good starting point to being able to run a 5k marathon.