Ka cika wannan jumla: A cikin daji, matsakaicin tsawon rayuwar gaggafa ita ce shekara 20, kuma wadda aka tabbatar da cewa ta fi kowa tsufa tana da shekara 38. A cikin kurkuku, sau da yawa suna rayuwa fiye da haka. A wani yanayi, wani mutum da aka kama a New York ya rayu kusan shekara 50. Kamar yadda yake da girma, matsakaicin tsawon rayuwar garken gaggafa kamar dai yana da nasaba da wurin da yake da kuma damar zuwa ganima. Tun da ba a tsananta musu sosai, yawan mutuwar manya ba shi da yawa. A wani bincike da aka yi game da gaggafa na Florida, an ba da rahoton cewa gaggafa da suka yi girma suna da kashi 100 cikin ɗari da suke tsira a shekara. A cikin Yarima William Sound a Alaska, manya suna da shekara-shekara rayuwa kudi na 88% ko da bayan da
Fitar da man fetur na Exxon Valdez ya shafi gaggafa a yankin. Daga cikin mutane 1,428 daga ko'ina cikin kewayon da Cibiyar Kiwon Lafiyar namun daji ta kasa ta kashe daga 1963 zuwa 1984, 329 (23%) gaggafa sun mutu sakamakon rauni, galibi sakamakon karo da wayoyi da ababen hawa; 309 (22%) sun mutu sakamakon harbin bindiga; 158 (11%) sun mutu sakamakon guba; 130 (9%) sun mutu sakamakon zafin lantarki; 68 (5%) sun mutu sakamakon kamawa; 110 (8%) daga fatara; da 31 (2%) daga cuta; ba a tantance dalilin mutuwa a cikin 293 (20%) na shari'o'in ba. A cikin wannan binciken, mutum ya haifar da 68% na mutuwar. A yau, ana ganin harbin gaggafa ya ragu sosai saboda yanayin da jinsin yake da shi. A wani yanayi, wani babban gaggafa da ke binciken gidan falcon mai yawo don abubuwan ganima ya sha wahala daga wani mahaifi mai yawo, kuma a ƙarshe ya mutu kwanaki daga baya. Za a iya kallon bidiyo na tarihin halitta na farko wanda ke nuna wani cougar ("Puma concolor") yana kwanto da kashe wani gaggafa maras kyau wanda ke ciyar da gawawwakin zomo a kan layi, kodayake wannan fim ɗin na iya kasancewa.