Also OP your history of former competition, injury/health issues, and now just coaching/ schooling/flat riding is common enough and perfectly respectable. If I’m correct, you have a good business model in running a barn specifically for adult women lower level amateurs in English disciplines in the middle of Cowboy Country (which trends very male)? Your clients will understand your personal history and it also gives you a point of empathy for them and their physical limitations which a gung-ho 22 year old coach on the rise might not have.
Riders choose coaches hoping that those coaches can advance their riding. When there’s advice to look at the coach’s show record, that’s just as confirmation the coach can do the thing. But lots of coaches, especially older ones, are long retired from actively competing at their former level, and indeed most coaches who take on a lower level clientele find it hard to pursue serious competition because the clientele needs hand-holding at the under 3 foots, and lessons on other weekends, and the coach can’t really cut loose for 3 days to go off to the higher level shows.
So if you are wondering about the optics of the coach just jumping round the cross poles
I wouldn’t worry. Your story can be that you went up to whatever height in your 20s, got injured, continued coaching, but you are taking Doodles the sales horse out for a schooling show along with your students oh, and isn’t the person who buys him going to be so lucky because he is such a good boy?? Actually getting a lower level prospect out to the lower level shows is a great marketing moment, and even if you just plan to sell him to a student, it doesn’t hurt if your students see other 2 foot 6 ammies praising him and expressing interest 