There are 25,567 or 25,568 days in 70 years of life, depending on there are 17 or 18 leap years during the 70 year period.
There are 52 weeks in a year. 52 x 70 = 3,640 There are 3,640 weeks in 70 years.
25,567 (including an extra day for leap years).
There are 365 days in a year, plus an extra day every fourth year (generally). So 70 years is approximately: 365 * 70 + (365/4) = 25,641 days give or take a couple depending on which 70 year interval is in question.
Just multiply 70 by whatever you choose to define as your standard year - 365.25, or perhaps 365.2422.
7 times 10 is 70. 7 days into ten weeks equals 70 days!