$4.5K at 24yrs old? It is very GOOD as compared to me when i was your age during my time.

I started in 1997 - Asian financial crisis.
Graduated with a IT degree from australia, but only managed to find a job that pays $2,000.
After 1 yr, job hopped to another job that pays $2.5k
After 1 yr, got promoted and got $3.1k
Around 1997+5yrs = 2002, I job hop again and landed with $3.7k
then in 2006, I got pay increment and had $4.5k.

So it took me 10yrs to get $4.5k !

Most of my peers who started around 1997 seems to have salaries that lagged alot compared to others who started later.

Conclusion drawn is if you are not the outstanding type (like me), your 1ST PAY is very important in negotiation for future pay increment! (You can see mine pay increment hovers around 15-20% most times)

So, I think for your case, it is safe to say you will definitely earn at least $8-9k after 10yrs!