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 men's world record in the 5k race is held by Joshua Cheptegei from Uganda with a time of 12:35.36 set in 2020.
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.
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.
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 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.