I started at 19 and haven't looked back. I do however have this haunting feeling that getting a degree in something completely unrelated would be an excellent foundation for life. People don't often think of the what ifs. What if you were to lose your medical? What if the industry goes into the tank? What if after 4 layoffs you say enough!
The boom starting now is unlikely to continue indefinately and maybe taking a little time to "diversify" your knowledge base would be a good thing. Then with some luck and timing, you could catch it all on the upswing next time.
We have a very unique career with very limited opportunities outside of flying itself where a degree in engineering, commerce, whatever could give you something to fall back on. That's one thing i wish i had.
Good luck with whatever direction you take.
CO