Yes, definitely start planning now, it's never to early to plan, you can always make changes to your plan in the future. These days, its tough to find people who truly care about fulfilling your wishes.
I realized something, when caring for my friend in her late 90s, who had not made hardly any plans at all - even if she would have made plans for someone to be in charge of overseeing her well being, say, when she was in her 60s or 70s, that person might not be able to do the job that far into the future, maybe that person wouldnt even still be alive, 20 or 30 years later when the lady was in her 90s. It just turned out that most of the people who cared for her and handled her affairs were people she met in her early 90s, who she had not known for long.
So many issues come up that are almost impossible to plan for. Thats one reason to make as many plans as possible now, to lighten the load later.
Bless You