i bought 2 ducks from a brooder and not sure how old it is

[ducklingsss]

is there a way i can tell how old my duckling is?

 

[Amiga]

I think you need to post a few more times, then you could upload a photo. How large are they? Do you know the breed? Have you read this? https://www.backyardchickens.com/t/750869/raising-and-caring-for-ducklings#post_10611711

 

[ducklingsss]

its a runner.