what a weird question.
no, you never get to be natural again. ever. A single cycle alters your body chemistry permanently, there's plenty of scientific data to back that up as a fact. A lifetime natural lifter is not the same as even one who hasn't cycled for 10 years.
Now, if we're talking about competition purposes, then yes, there are definitely federations that will consider you as a natural competitor after a period of time. You would have to check with federation rules to know how long this is. It varies.