James McAvoy as Bilbo Baggins?

[William Cloud Hicklin]

Yes they do. They officially come of age at thirty-three, rather than 18 or twenty-one as we do. They live for around 120 years rather than four-score and ten.

Have you been following this thread?

JRRT rather wryly postulated 33 as legal age because (in his professorial view) 21-year-old humans aren't remotely mature yet, and Hobbits are sensible enough to realize it.

(and hobbits typically only reach 100, not 120).