What's the breed of this huge hen?

[FattyChickens]

I haven't weighed her but she has laid two very large tan eggs with white speckles, and she is much heavier than my other chickens
(Bottom egg is hers)
And is there any way to tell age?

 

[21hens-incharge]

She looks to be a black sex link.
I would say she is over a year but less than 5 going by leg scales and face. Telling age on adult birds is rather challenging at best.

 

[SilverBirds]

She looks to be a black sex link.
I would say she is over a year but less than 5 going by leg scales and face. Telling age on adult birds is rather challenging at best.

X2