I wonder if it's even a question you need to consider if she's
with someone right now... How would you feel if you her boyfriend?
On the other hand, it may be good to know that it is an issue for
her. In future, find out more about the other person before
investing your emotions in it. It may be futile to talk about al
this since she's off the market...
If there is someone else who is older than you (who is available)
that comes which arouses your interests, you may want to check out
the possibility of it being worked out for her. Most women do not
look for younger guys cos of maturity. another issue is she may be
financially more stable than him and it may sit down well with him
or her....
just some thoughts...