19 years in a tree
12 months in a year
30 days in a month
24 hours in a day
3600 seconds in an hour
So, you're wrong. I suppose I should've counted leap years and went straight from years to days, but then I wouldn't have been able to do this without the aid of a calculator. I also should have done a more accurate margin of error, which would have included the extra month that I've been alive into the total time, and divided that into the month's worth of seconds.
Why yes, I do know how to divide a 7 digit number by a 9 digit number. I shouldn't be getting a number on the 7th magnitude, anyways. That would have made me much younger than I actually am!