just think in terms of premature aging.
like with any chronic disease or life in general, hope for the best but prepare for the worst. stay informed on clinical trials, exercise, exercise, exercise. realize that you may become disabled - old - sooner than you planned and plan accordingly financially, insurance wise, etc.

google pd news everyday.
there are no simple alternatives to dopamine replacement imho or any supplements you can take that have been proven to significantly slow down the progression, others will disagree. i watch this website and others for anecdotal stories.

here's a good web site.
http://www.nwpf.org/wellness/Physica...dications.aspx