age: 17.4 years old as of this posting
gender: male
natural LDer from ~5-12
lost ability at ~12
started trying to have LDs and dream recall at 14-15
started to succeed at 16
high-level LDs when natural: well over 200 with an average of 5 a week...
LDs since relearning: 15 high-level, about 30 low-level, and too many non-lds to count.

If you're a natural.. don't take it for granted, because it may leave you.

And howetzer, I'm pretty sure that as you age, sleep becomes lighter and less time is spent in delta, with more being in REM. I'll double-check my sources though.