Forum:Luffy immortal

I just want to know what other people think of this question I had. Luffy ate the rubber fruit right making him a rubber man.

So here i my question will that mean he will never truly grow old.

Reason for this if he's made of rubber would that mean his skin an orgens remain strechy and retain there youthful viger.

I would like peoples opinion on this plz no bashing this is just a crazy question i thought might invoke a discussion.