Sounds like it.I have 3 barred rock hens and they were hatched last year early May 2017 and they didn't start laying until end of December 2017. So they were around 30 weeks old I believe.
Here it is August 2018 and they still lay little pullet size eggs.
Mine aren't the greatest but maybe I got a bad strain or line.
That’s too bad.
BR lay a larger sized egg as far I know.
Are yours from a hatchery or breeder?
A lot of times breeders birds develop slower.
The eggs should get larger over time.