https://spacescoop.org/en/scoops/2317/when-exactly-do-we-celebrate-planet-birthdays/

Just how young can a proto-planetary disk be and be forming planets? Proto-planetary discs only exist for a few million years, which means that all planet formation in the system must take place within this, uh, narrow time frame. 

 

But until now, astronomers have not been able to pinpoint how fast planets form in these discs. After years of study and observation of proto-planetary discs, astronomers found these discs have even deeper mysterious layers of structure within them. 

 

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