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Assuming a 90 year spell includes 22 leap years, the number of days is equal to (68 x 365) + (22 x 366) = 24820 + 8052 = 32872 days. If the 90 year spell includes 23 leap years, the number of days is equal to (67 x 365) + (23 x 366) = 24455 + 8418 = 32873 days. 3 people found this useful.
The total number of days between Thursday, January 1st, 2015 and Wednesday, April 1st, 2015 is 90 days. This is equal to 3 months. This does not include the end date, so it's accurate if you're measuring your age in days, or the total days between the start and end date.