You know when your birthday is, but how old should you really be?
Just put an x on the things you do)

[x] I know how to make a pot of coffee.
[x] I can cook for myself.
[ ] I think politics are exciting.
[ ] My parents have better things to
say than my friends.
So far: 2

[ ] I show up for school/college/work
every day early.
[ ] I always carry a pen/pencil in my
pocket/purse.
[ ] I've never gotten a detention
[x] I've watched talk shows.
[x] i know what credibility means
without looking it up.
[ ] drink coffee at least once a week.
So Far: 4

[x] I know how to do the dishes.
[x] I can count to 10 in Japanese.
[x] When I say I'm going to do
something I do it.
[ ] My parents trust me.
[ ] I can mow the lawn
[x] I can make adults laugh without
being stupid
[ ] I remember to water my plants.
[x] I study when I have to.
[x] I pay attention at school/college.
[ ] I remember to feed my pets.
so far: 10

[x] I can spell experience without
looking it up
[x] I clean up my own mess.
[ ] The first thing I do when I wake up
is get caffeine.
[x] I can go to the store without
getting something I don't need.
[x] I understand jokes the first time
they are said.
[x] I can type quickly.
So far: 15

[ ] I have realized that the weather
forecast changes every hour.
[ ] I have realized that no one will
take you seriously unless you are over
the age of 25 and have a job.
[x] I can read a book and actually
finish it.
So Far: 16

(now add them all up)

re-post as, my mental age is ..