I have succsefuly attempted this experiment. I'm smokin bud off a 2yo bitch (outdoor). just cut plant back at end of cycle to those bottom shitty lil buds not worth smokin. They will grow a lil coarse and dry as plant enz first season. BUT keep watering etc and plant will go through growth stage once more-even starting off with single leaf then three leaf etc. It will come back hard making great cloning ma's. the clones will bee same age as the ma.
This is great coz you know you have a female every season and potency increases and plant gets bushier every season increasing yeild. IMPORTANT to keep males well away- but if you do get polination next year be more careful with males and that bitch will throw out some excelent bud.
use the force
goodluck