<human>: Here's the story...

So I'm 20, soon 21, male. 
My girlfriend recently turned 29. 

As we've been together for half a year, we've been asking ourselves questions that would come with the "long-term goal" stuff. For instance, will this work out, what to do, etc.

Here's a back story: she's in a field that is forcing her to relocate to a place that's over 2 states away, but within reach nonetheless as her pay will be pretty darn good. 
I, however, am still studying and in college for a bachelor's degree. 

We've been in a long distance relationship for the duration of the past six months, and have been seeing each other once or twice a month for a long weekend or a week or more. 

We are both really in love with each other, and I for one truly feel very strongly for her, but concerns are coming up.

For instance...

- Will she be too old, say, for kids and the likes when I've been established in the workforce and have a decent enough income.
- Will our age gap be too apparent and shamed upon by society?
- On that, will others think it's weird and frown upon this relationship of ours?
- Is it actually wrong to date someone older than you as a guy?

The issue now is that with her moving for two years, our visits won't be as frequent (also considering she only gets 3 weeks off per year).
This isn't to say our feelings will change, in fact I expect they'd grow stronger, but we still both are, plainly put, afraid of what is to come, and basically aren't sure if this is a "good idea" in the first place, but neither of us want to break up... She wouldn't have gone out with me had she not seen that I'm much more mature than people of my age.

What do you guys think?
Is this wrong? Is it fine? 
Will she be too old? Am I too young?

Can you condense the text into three sentences or less?
<bot>: Me (20M) & GF (29F) concerned about how to deal with age gap, whether it's "acceptable", and if we can hope for a future in general.