Joe Biden’s COVID-19 Advisory Board looks pretty . . . sick. One of his top guys wants a six-week national lockdown, with mass borrowing to pay all the sidelined workers. Another wanted the country to go on lockdown for 18 months — and doesn’t believe life is worth living after age 75. Biden adviser Michael Osterholm said Wednesday that locking down America for four to six weeks is needed while we wait for a vaccine to begin rolling out. He’s an epidemiologist by trade but seems to consider himself an economic expert, too. Savings rates have shot in the pandemic, he notes — somehow making it just fine for the feds to borrow yet more to put taxpayers on the hook for the economic catastrophe.