system
Given the following post, respond as if you're commenting on Reddit:
human
Are 1st and 2nd year PhD students usually expected to teach? Is being younger than the students you are teaching weird?

Hello,

I am currently an undergrad math student. I will be graduating with my bachelors at the age of 19 and will go for my PhD after that. Would the fact that I would still be 19 make the teaching aspect more difficult?

Thank you for your help.
gpt
Many universities have a policy or informally try to make sure those teaching have at least one degree higher than those they are teaching. Sometimes even terminal PhD programs will have students pick up an MA/MS along the way, or set a point of progress (x number of grad credits) before you can teach undergrads). 

Try to avoid teaching immediately if you can. If you must teach, dress professionally and maybe try to make some sessions online if it is a predominantly face to face class.