Go here and try it.
As of this post, I am
“11753 days, 5 hours, 19 minutes and 0 seconds”
Damn, looks like I better break out the Geritol :o
9334 days, 5 hours, 9 minutes and 59 seconds
But I dare say it’s out by at least a day… I don’t know what the time was in America when I was born in Australia - I know it would have been the fourth, not the fifth of September.
As a bonus, I’ve been married:
94 days, 19 hours, 48 minutes and 26 seconds
(Or 8192906 seconds or 136548 minutes or 2275 hours)
For a more morbid view, try the Death Clock.
I am 655,989,983 seconds old. 655,989,984… 655,989,985… 655,989,986…
I am 6946 days, 7 hours, 19 minutes old. Unfortunately, I’m not sure exactly what second I was born so I left that extremely important information out.
1,237,095,074 seconds. That’s a fair-sized number.
And I like the Death Clock. At my age, it’s nice to have something to look forward to.
17594 days, 20 hours, 38 minutes and 29 seconds
No wonder I’m a bit winded…
Woohoo! I am 17611 days, 12 hours, 22 minutes and 59 seconds
Or 1521634979 seconds or 25360582 minutes or 422676 hours.
And I don’t look a day over 16000. 
Interesting, it doesn’t ask for a.m/p.m. on the start date—maybe it’s military time?
At any rate, I am 9054 days, 21 hours, 17 minutes and 0 seconds.
Well, at least I’m not the oldest. Though my 35th birthday last month has really hit me hard.
12814 Days, 0 Hours 22 Minutes,
or 1107130920 seconds.
And I’m feeling every one of them, baby!
14500 days, 8 hours, 5 minutes and 57 seconds
Yes, the format for entering time is “military time” I forgot to mention that in my OP. Oops.
Note: For those who may not be aware:
Midnight is 00:00 NOT 24:00
So, if you were born at say, 12:15 am, as I was, you’d simply use no hour in field 1, and simply enter 15 minutes and (blank) seconds.
Hey, great site. It made me feel old:
I'm 8401!!! days or 725846400 seconds or 12097440 minutes or 201624 hours8031 days, 4 hours, 3 minutes and 0 seconds
An eternity for a mouse a day for a tree.
If time is man made why doesn’t it come with instructions?
Clever Hans: A purveyor of silly questions that hopefully have silly awnsers.
11705 days, 14 hours, 55 minutes and 3 seconds…
…no wonder I’m so damn tired. 
OMG. That kind of freaked me out a little bit, even on the “Optimistic” setting.
I am 9915 days, 11 hours, 52 minutes and 26 seconds old
(Or 856698746 seconds or 14278312 minutes or 237971 hours)
Jeez, I’m really approaching 946771200 seconds pretty fast
I always thought I’d be married by the time I was 788918400 seconds old.
sigh
stv
9204 days, 21 hours, 58 minutes and 11 seconds
I am 10511 days, 16 hours, 9 minutes and 0 seconds old
More importantly, I will celebrate my 1 billion second aniversery on: Monday February 21, 2005 at 7:39:40 pm. Hope to see you there. It should be a short one.
Don’t worry too much, auntie em - if you put in my Grandfather’s details, it says his date of death is Sunday March 1, 1992. Don’t know how to break it to him that he should have been celebrating his 10th anniversary a couple of weeks back… of course, in Optimitic mode, he’s still got another 9 years to go!