Comment by jcranmer

In the US (I believe all common law systems), the jury is the trier of fact. If there is a genuine factual dispute between the two parties in a lawsuit, then that dispute is resolved by a jury (unless the parties opt-out).

Statutes of limitations are usually not tried by juries because the underlying facts that cause them to kick in are usually not in actual dispute. Instead a fight over statute of limitation is more likely to be over which statute applies or whether some other mitigating circumstance is kicking in, which are matters of law which do not go to a jury.