Sorry, I didn't even look at your age! I didn't mean to write like you were an old man
. Actually my English is not that good either
It'd be a really hard work to do.
And you wouldn't be able to know the exactly age.
A way to do it, as someone said before, is calculating through genealogical records. If you think the bible is true then the years can be calculated that way, you can have an estimate number. And if you believe the authority of the bible, it couldn't be compared to a scientist opinion.