Bro serenity1805,
I think a couple of mates, especially Devil can give fantastic
advices pertaining to this problem of yours
1) I think that you are in a unique situation, something almost
unconventional, therefore make no promises you CANNOT deliver. and
you have to be prepared to change your mindset, and ignore the
social stigmas, stares, glares and the gossips...have to be really
strong for it. After all, younger men and older women are not a
common sight, let alone those with a huge age gap.. I remember
somebody here once said, we all live in a society where we abide by
the norms and live by the norms. We all avoid risks, always
conventional, tried and tested, for we fear having to adapt to the
uncommon and unforeseen, and few are willing to take the less
common paths in life, eg, entreprenuership, etc.... Therefore, make
certain of your goals and if you know for certain that she's the
one, go in with the blind faith, listen to your heart and don't
ignore your head. You are responsible for your happiness, not
others, nor even your parents. You can marry a 18yo gal and still
end up in divorce. Age is a factor, but not THE factor.
2) You have to understand that the huge age difference may result
in not only look imcompatibility cos women matures much faster, but
MORE IMPORTANTLY, Biological imcompatiblity, ie there may be
problems in conceiving. and babies may not turn out to be rocket
scientist 
. Know what i'm saying ? Look not only at
the potential present problems, but more IMPORTANTLY, look beyond
at the POTENTIAL FUTURE PROBLEMS, cos in a relationship like this,
problems will crop up in the future, and they'll be a lot more than
a conventional relationship.
3) She will be very insecure, as she may feel that she is way past
her prime, and would be very uncomfortable with younger gals which
she may view as potential competitors. If she's really a nice girl,
she may even feel that she's unworthly of you. Reassure her
constantly. Show her through not words of mouth, but actions.
4) Tell her that nobody knows what the future beholds, and if you
guys are willing to take the plunge, which i highly encourage you
to do so, TRY IT, so you won't look back with "WHAT IFS".... and
let her know that should things not work out, you still wanna keep
her as a confidante and friend, cos she is one hell of a nice
person to find, and good things don't happen all the time. You have
to be prepared that things may not work out. Its one hell of a
obstacle to overcome, but it would be better if you guys start out
slow, and see if things work out. By that, i mean, good friends
first and see where it goes. Utimately, you guys havent even meet
face to face, so you never know. She and you may not be attracted
to each other superficially, by then, whats there to talk
about?
Lastly, allow me to quote DR. MARTIN LUTHER KING JR
"Cowardice asks the question, Is it safe? Expediency asks the
question,
Is it politic? Vanity asks the question, Is it popular? But
conscience asks
the question, Is it right? And there comes a time when one must
take a
position that is neither safe, nor politic, nor popular, but he
must take
it because his conscience tells him that it is right."
