70% of children born to teen mothers are fathered by men over the age of 20. In other word, 70% of child pregnancies occur because of adult men.

The claim that 70% of children born to teen mothers are fathered by men over the age of 20 is supported by multiple studies and reports dating back to the 1990s and continuing in more recent research. Research from California in the mid-1990s found that about two-thirds of babies born to teenage mothers were fathered by adult men several years older than the mothers, rather than by peers of similar age.spokesman.comspokesman.comAdult Men Fathering Teens' Babies Study Finds Age Gap Between Majority Of Dads,... Similarly, a Guttmacher Institute study from the late 1990s reported that almost two-thirds of teenage mothers had partners aged 20 or older.guttmacher.orgguttmacher.orgAge Differences Between Minors Who Give Birth and Their Adult Partnersguttmacher.orgguttmacher.orgUsing - and Misusing - Data on Age Differences Between Minors and Their Sexual... While exact percentages vary slightly depending on the population and study, the figure of around 70% is consistent with these findings. This means that a significant majority of teen pregnancies involve adult men rather than teenage peers. However, it is important to note that this statistic specifically refers to births to teen mothers and does not necessarily represent all adolescent pregnancies or sexual encounters.

The statement's second part, "In other words, 70% of child pregnancies occur because of adult men," is a reasonable interpretation within the context of teen births but should be understood as applying specifically to pregnancies resulting in live births among teenage mothers. It does not imply that all adolescent pregnancies or sexual activity involve adult men, nor does it address other factors influencing teen pregnancy rates.

In summary:

Therefore, the claim is mostly true but requires contextual nuance regarding what "child pregnancies" encompasses.