I am a 10 year old boy that baths himself. Whenever my aunt babysits she baths me along with my 6 year old girl cousin. Is this typical?

It's not uncommon for family members to bath younger children together, especially if they're close in age. However, as children get older, they often prefer privacy during bath time. Since you're 10 years old, it's perfectly okay to express that you would like to bathe by yourself. You can talk to your aunt about wanting some space and see what she thinks! It's all about finding what makes you comfortable.