Could my 21 yr. old Arab mare barrel race or pole bend?

She is an registered Arabian broodmare and she had a baby a few months ago, if I got her really fit and worked with her every day would it be okay for her to barrel race? I don't want to hurt her if she is too old. She doesn't look like shes 21. But I would like to do somthing in rodeos or somthing, I would also like to try pole bending if barrel racing doen't work and If pole bending is not to harsh for her either. I just want to know if It would hurt her if I did any of thoes. Sorry if thats confusing. Thanks!