$5000$ to celebrate 5000 followers, I write one problem each day for $5000$ days.

I've decided to, instead of writing one problem that uses the numberIf I was born at the end of November 1999 and it is the beginning of March 2015 when I start my $5000$ problem writing streak, how old will I be when I finish writing all the problems?

27
30
28
29

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First, $5000$ days converts to $13$ years and $8.3$ months.

Now, if I was born in the beginning of November 1999 and it is only March 2015 right now, then I am 15 years old right now. After $13$ years, I am 28 years old. Now we must figure out if in the $8.3$ month period, if I celebrate another birthday.

Indeed, the separation between the beginning of March and the end of November is $9$ months, so I will not celebrate a birthday that year.

Therefore, I will be $\boxed{28}$ years old when I finish.

Fun fact: everything in this problem is true at the time I wrote the problem.