Registration for the 2022 Mount Marathon Race begins on March 1.
One of the main criteria for determining whether you need to register as a priority runner or for the lottery is the Top 50 Percent in Age Group Rule, which was adopted by the Mount Marathon Race Committee in early 2020 and is being implemented for 2022 with results from the 2021 race.
These PDF links show who placed in the the Top 50 Percent of their age group in 2021 (note other Priority Registration clauses and exceptions below).