The more precise answer is: 10 years, 4 months and 13 days. This was calculated from the last day of 2015 (December 31) until today.
2015 was 10 years ago because we are now in 2026.
2015 was 124 months ago because we are now in May 2026. Here's how to calculate this: there are 12 months in a year so, 10 x 12 = 120. Four months have passed since the start of 2026 which also need to be added, meaning 120 + 4 = 124.
2015 was 540 weeks ago. Although it may seem counterintuitive, the simplest approach is to first calculate the number of days since 2015 and divide that by 7 (the number of days in a week). In this particular situation, 3786 / 7 = 540.86 from which we only need the whole number part, 540.
2015 was 3786 days ago because today is May 14, 2026. Each typical year is at least 365 days long, so multiplying 10 years by 365 results in 3650. Factoring in the days passed since the beginning of this year we get 3650 + 133 = 3783. Of course, the 3 leap years during this period also have to accounted for. So adding 3 more days we end up with 3786 days in total.
As an academic exercise, it’s also possible to calculate how many hours passed since 2015. Given that we already know there are about 3786 days between then and now, we can multiply this number by 24 (the number of hours in a day) to get 90864 hours. Since it's currently 6:15 PM, we need to add the 18 hours that have passed since midnight to our subtotal of 90864. So 90864 + 18 = 90882, ergo 2015 was 90882 hours ago.
A lot went on in 2015, but for a quick glimpse of the most memorable events, take a look at the cover of TIME Magazine’s “The Year In Review 2015”.