True, there's a difference between like and love. If you like the girl, I don't think you should jump into marriage yet because you're probably not sure if you really love her (should get to know her a lot more). On the other hand if you love the girl, why not.
What happens if she was single all her life till she met you. There goes your plan out the windows.-whistle
I don't see any problem, who said you had to date anyone younger, I prefer mature females anyways, if she bangin', go for it
If a girl is older than you are a few years (1-4 )and if she does not mind. Why should you? There is two exceptions if she looks older than you, and you do mind if she approaches 30 or older since she may has child bearing issue else: you don't care about that. What stops you?