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Males are sexually mature at their sixteenth molt , which is usually their eighth or ninth year . Production started in 1997 , but the field is already mature with a rapidly declining oil production , currently producing approximately 35,000 bbl / day from 8 oil producers , in addition to injection of the associated gas into 4 gas injectors . Another issue is that some sites may be too mature for all users of the internet . Black bears are sexually mature at 3.5-7.5 years . The kids were really mature about it ; they immediately asked where they could send sympathy cards . Females breed at one year of age ; males may be sexually mature at the same age but often do not mate until their second year .