Running, Distance Running

Hello.

Unfortunately no one on here can answer that question for you. That is because it is required for a university assignment. Therefore, it needs to be supported by research. Find the research then you find the answer.

A few things to think about….
Are you looking at the oxygen uptake kinetics? Or aerobic power (VO2max)? Or both?
How are you defining the age categories, e.g. Child = < 18? Or before puberty?
Look at how and why VO2max reduces after a certain age in adults (by 1% per year). Why does this happen? It there a reduction in muscle mass over age or Haemoglobin levels etc.

Try this book.

ACSM's resource manual for guidelines for exercise testing and prescription / American College of Sports Medicine; [Leonard A. Kaminsky ... et al., editors].
2006 (5th ed.)

It has a chapter on what you are looking for….

There will also be a reference section in the back of the chapter to help you with your literature search.

Hope this helps a little.

Good luck.

Children(till 18) have lower VO2max that can reach 55mmol/kg/min than adults but greater recovery.