I believe there's more recent evidence suggesting that paternal age may also play a role but there's a confounding factor there that paternal age is strongly linked to maternal age.
Is that because parents with autism have children later in life than those without? I mean, what exactly is the link? FTA: "So what's going on? That isn't clear. Older parents' genes can undergo changes caused by aging and by the environment"
I believe there's more recent evidence suggesting that paternal age may also play a role but there's a confounding factor there that paternal age is strongly linked to maternal age.