You have been there and experienced those things, you've learned that there are bigger fish to fry, but they will be experiencing it for the first time and it will have greater significance to them.
The important thing is that you can share in that positively with them and not patronise them or lessen the experience.
The best advice I could give you, personally, is that her parents may be somewhat disapproving and it is very important that you respect their concerns.
I make enough for us both, but she wants her own personal security which i completely understand and want her to have.
A lot of people are saying that 5 years isn't a lot, but I would disagree here.
I would also recommend NOT sleeping with her if the opportunity comes up swiftly after your first date.
In fact, I would suggest that, if she were to go down that route, then it is a warning sign of immaturity.
If she can engage with you and talk to you and doesn't feel like she has to protect herself or play up to your expectations then I would say that she is fairly mature for her age.