That would be my grandchild, Opal Eleanor Armstrong Zwicky — what a string of names! — who is (decimal) 20 today. For OEAZ on the occasion, this tiny poem:
One score for Opal
Vigesimal 10, the first day of
Her second score —
No longer a teen, now in
Her 20s —
The crowds cheer
Her breakthrough
Now, since I’m irremediably a linguist, a dip into the noun score in games and the measure noun score ’20 years; 2 decades’, which are listed together in dictionaries because, surprisingly, they have the same origin.