The more precise answer is: 35 years, 6 months and 23 days. This was calculated from the last day of 1990 (December 31) until today. For example, someone born in 1990 would be 35 or 36 years old. If they were born on or before July 24, they would be 36 years old and if were born after, 35 years old.
1990 was 35 years ago because we are now in 2026.
1990 was 426 months ago because we are now in July 2026. Here's how to calculate this: there are 12 months in a year so, 35 x 12 = 420. Six months have passed since the start of 2026 which also need to be added, meaning 420 + 6 = 426.
1990 was 1855 weeks ago. Although it may seem counterintuitive, the simplest approach is to first calculate the number of days since 1990 and divide that by 7 (the number of days in a week). In this particular situation, 12988 / 7 = 1855.43 from which we only need the whole number part, 1855.
1990 was 12988 days ago because today is July 24, 2026. Each typical year is at least 365 days long, so multiplying 35 years by 365 results in 12775. Factoring in the days passed since the beginning of this year we get 12775 + 204 = 12979. Of course, the 9 leap years during this period also have to accounted for. So adding 9 more days we end up with 12988 days in total.
As an academic exercise, it’s also possible to calculate how many hours passed since 1990. Given that we already know there are about 12988 days between then and now, we can multiply this number by 24 (the number of hours in a day) to get 311712 hours. Since it's currently 11:01 PM, we need to add the 23 hours that have passed since midnight to our subtotal of 311712. So 311712 + 23 = 311735, ergo 1990 was 311735 hours ago.
Here’s a summary of 1990's biggest highlights, as seen on the cover of LIFE Magazine's “The Year In Pictures 1990”.