Biogerontology is the sub-field of gerontology concerned with the biological aging process, its evolutionary origins, and potential means to intervene in the process. It involves interdisciplinary research on biological aging's causes, effects, and mechanisms. Conservative biogerontologists such as Leonard Hayflick have predicted that the human life expectancy will peak at about 92 years old,[26] while others such as James Vaupel have predicted that in industrialized countries life expectancies will reach 100 for children born after the year 2000.[27] and some surveyed biogerontologists have predicted life expectancies of two or more centuries.[28] with Aubrey de Grey offering the "tentative timeframe" that with adequate funding of research to develop interventions in aging such as Strategies for Engineered Negligible Senescence, "we have a 50/50 chance of developing technology within about 25 to 30 years from now that will, under reasonable assumptions about the rate of subsequent improvements in that technology, allow us to stop people from dying of aging at any age," leading to life expectancies of 1,000 years.[29]