An astronomer team has observed some of the youngest planetary disks ever seen. Designated as Class 0 and Class 1, these are planetary systems younger than 300,000 years old. Even at this early stage of star formation, the protostars are surrounded by disks with rings and spiral structures that indicate where new planets could be forming. It was previously believed that planets couldn't form before the first million years, but there they are.

https://public.nrao.edu/news/early-evolution-of-planetary-disk-structures-seen-for-the-first-time/