How do I add a person on facebook when....?

[Jeff]

So how do i add a person on facebook that i see a couple of times a week but don't talk too? Cuz i want to add them but i don't want to seem like a weirdo or a creep. Cuz we know who each other are but we just don't talk there's a 2-3 year age gap but i just don't want to seem like a creep if i add this person... Im older then her and she does sports with my sister.