Let's say you were arrested for something nefarious, and the judge offered you a deal.
You can sit in jail from ages 30-40, without any parole in that time
You can enter prison at the age 65, and stay there for the rest of your life
If you choose the latter, you will have all memory of this conversation erased (it's a completely hypothetical question so don't point out that such technological breakthroughs haven't been discovered yet), until you're 65, when you're carted off to prison, that way, you can't spend the next decades preparing or killing yourself before then, thus removing the possibility of serving jail time period.
Now, would you rather serve a decade of some of the most prime years of your life, which are usually spent on family and career and so forth, really a vital decade of your life as far as development goes, and a decade that's quickly approaching the lot of you. Or would you rather spend the tail end of your years in prison, knowing full well that you will die behind bars, and there's the possibility that you might actually serve much more than 10 years.