Sometimes I feel like a mental-health professional,” says Robert Weiss, M.D., a dermatologist in Hunt Valley, Maryland. “People get fixated on things they see in a magnifying mirror that nobody else notices. I tell most patients, ‘Let’s do the absolute minimum.’ Then there are those who feel that getting work done is the only way to stop aging. You don’t want to confuse maintenance with being age-obsessed. If you’re 55, you can’t possibly look like you’re 25—but you can keep people guessing.”