Guys flirting with my aunt

I'm 19 years old male. My mom is 38 years old and divorced (yes she did have me when she was 19). My aunt is 34 years old ( my mom's sister.) Me and my mom go to a local gym together and we take my mom's sister (my aunt) to stay in shape. I'm in fairly good shape and have decent muscles. Well I'll get straight to the problem. Me and my aunt don't workout together because she does her own thing and I do our own thing. I don't have a problem with my aunt talking with other guys but she has many guys approach up to her flirt with her. I see her standing with a guy almost every week chatting and smiling. Thats all cool but she thinks that the guys are just "casually" talking with her but in reality, they're trying to get in bed with her.

I think the problem might be the yoga pants and the pink tight top but I can't tell her what to wear. My mom isn't really that "hot." She is around 5'6 with a good face because of all the anti-aging creams. Her body is decent, her tits are medium but her ass is probably the same as Kim Kardashian's. It's tight but it is really wide and pops out quite a lot. My aunt probably has the nicest ass in the gym amongst all women. What should I do? How can I stop guys from flirting with her because I don't want her getting fucked by other guys. Me and my mom want to help find my aunt a suitable partner not a fuck buddy. HELP AND ONLY USEFUL COMMENTS. DON"T POST HORNY AND STUPID COMMENTS.